Answer:
The unit rate in this equation is 60 mph.
a sample of 75 students found that 55 of them had cell phones. the margin of error for a 95onfidence interval estimate for the proportion of all students with cell phones is:
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is approximately 0.0932.
To find the margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones, we can use the formula:
Margin of Error = Z* * sqrt(p*(1-p)/n)
where:
Z* is the z-score corresponding to the desired level of confidence (in this case, 1.96 for 95% confidence)
p is the sample proportion (55/75 = 0.7333)
n is the sample size (75)
Plugging in the values, we get:
Margin of Error = 1.96 * sqrt(0.7333*(1-0.7333)/75)
Margin of Error ≈ 0.0932
Therefore, the margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is approximately 0.0932.
To learn more about margin of error, refer below:
https://brainly.com/question/29101642
#SPJ11
Students are conducting a physics experiment on pendulum motion. Their 30 cm pendulum traverses an arc of 15 cm. to the nearest degree, how many degrees of rotation did the pendulum swing?
The nearest degree, the pendulum swung approximately 29 degrees.
To find the degrees of rotation for the pendulum swing, we'll use the arc length formula and the definition of a radian. The formula is:
Arc length = Radius × Angle (in radians)
We have the arc length (15 cm) and the radius (30 cm). Rearrange the formula to find the angle:
Angle (in radians) = Arc length / Radius
Angle (in radians) = 15 cm / 30 cm = 0.5 radians
Now, convert radians to degrees using the conversion factor (1 radian ≈ 57.3 degrees):
Angle (in degrees) = 0.5 radians × 57.3 ≈ 28.65 degrees
So, to the nearest degree, the pendulum swung approximately 29 degrees.
To learn more about pendulum here:
brainly.com/question/4290205#
#SPJ11
solve the problem. given that p(a or b) = 1/6 , p(a) = 1/8 , and p(a and b) =1/9 , find p(b). express the probability as a simplified fraction.
The probability of event B is 11/72
What is Probability?Probability is a measure of the likelihood of an event occurring. It is expressed as a number between 0 and 1, with 0 indicating impossibility and 1 indicating certainty, and is based on the ratio of favorable outcomes to total possible outcomes.
According to the given information:
We can use the formula for the probability of the union of two events:
p(A or B) = p(A) + p(B) - p(A and B)
Substituting the given values, we have:
1/6 = 1/8 + p(B) - 1/9
Simplifying this equation, we get:
1/6 = (9 + 72p(B) - 8)/72
Multiplying both sides by 72, we get:
12 = 9 + 72p(B) - 8
Solving for p(B), we get:
p(B) = (12 - 1)/72 = 11/72
Therefore, the probability of event B is 11/72
To know more about Probability visit :
https://brainly.com/question/11234923
#SPJ1
The probability of event B as a simplified fraction is 11/72
What is Probability?
Probability is a measure of the likelihood of an event occurring. It is expressed as a number between 0 and 1, with 0 indicating impossibility and 1 indicating certainty, and is based on the ratio of favorable outcomes to total possible outcomes.
According to the given information:
We can use the formula for the probability of the union of two events:
=>p(A or B) = p(A) + p(B) - p(A and B)
Substituting the given values, we have:
=> 1/6 = 1/8 + p(B) - 1/9
Simplifying this equation, we get:
=>1/6 = (9 + 72p(B) - 8)/72
Multiplying both sides by 72, we get:
=> 12 = 9 + 72p(B) - 8
Solving for p(B), we get:
=> p(B) = (12 - 1)/72 = 11/72
Therefore, the probability of event B as simplified fraction is 11/72.
To learn more about Probability refer the below link
https://brainly.com/question/11234923
#SPJ1
A cartographer at point C sites a prominent rock feature, at point R, East from his location. There is a grassy peak, at point G, at a distance of “y” miles directly North of the cartographer. The angle formed by the cartographer, rock feature, and grassy peak is “x” degrees. See the diagram below. Using complete sentences, explain how the cartographer can use only these two measurements to calculate the distance from the grassy peak to the rock feature.
True: A Chorochromatic map is a type of cartographic map that represents features depending on how they are distributed across the surface in terms of quality.`
We have,
The art and science of cartography involves visually depicting a geographic location, typically on a flat surface like a map or chart. It could include superimposing a region's depiction with non-geographical distinctions like political, cultural, or other ones.
Making and utilizing maps is the theory and application of cartography. Cartography, which combines science, aesthetics, and method, is based on the idea that reality may be described in ways that effectively convey spatial information. The same basic components are included on most maps: the main body, the legend, the title, the scale and orientation indications, the inset map, and the source notes.
To know more about cartographic Maps, visit:
brainly.com/question/17665913
#SPJ1
complete question:
a cartographic map style that symbolizes features based on the qualitative surface distribution of a mapped feature is called a chorochromatic map.
Which relation is a function?ll
Answer: Option 1
Step-by-step explanation:
In a function, each input can only have one output. This rules out option 2 and option 4.
Next, a graphed function must pass the vertical line test. This rules out option 3.
This leaves us with option 1, the correct answer option. Option one is a function.
The following linear differential equation models the charge on the capacitor, q(t), at time t in an RLC series circuit. L d^2q/dt^2 + R dq/dt + 1/C q = E(t) Find the charge on the capacitor when L = 10 henry, R = 20 ohms, C = (6260)^-1 farad, and E(t) = 100 volts, with the initial conditions q(0) = 0 coulombs and i(0) = 0 amperes.
The charge on the capacitor at time t is given by q(t) = -21292.5e^(-0.00878t) + 21292.5e^(-314.53t) + 626000 coulombs.
How to find the charge on the capacitor?To find the charge on the capacitor, with the initial conditions q(0) = 0 coulombs and i(0) = 0 amperes, we use the given linear differential equation:
L d^2q/dt^2 + R dq/dt + 1/C q = E(t)
We can solve for q(t) by finding the roots of the characteristic equation, and assuming a particular solution. Then we use the initial conditions to solve for the constants in the general solution.
The solution to the differential equation is:
q(t) = -21292.5e^(-0.00878t) + 21292.5e^(-314.53t) + 626000
Therefore, the charge on the capacitor at time t is given by q(t) = -21292.5e^(-0.00878t) + 21292.5e^(-314.53t) + 626000 coulombs.
Learn more about charge on capacitors
brainly.com/question/29301875
#SPJ11
Classify the following triangles as obtuse, acute, or right triangle, using the side- length relationship. a. 15, 16, 17 b. 20, 18, 7 c. 17, 144, 145 d. 24, 32, 40.
a. 15, 16, 17 : The triangle is an acute triangle
b. 20, 18, 7 : The triangle is an obtuse triangle
c. 17, 144, 145 : The triangle is a right triangle
d. 24, 32, 40 : The triangle is a right triangle
Classifying triangles as Obtuse, Acute or RightFrom the question, we are to classify the given triangles as obtuse, acute or right triangles
To classify the triangles, we will consider the longest side of the triangles
If the square of the longest side is lesser than the sum of squares of the other two sides, the triangle is acute If the square of the longest side is equal to the sum of squares of the other two sides, the triangle is rightIf the square of the longest side is greater than the sum of squares of the other two sides, the triangle is obtusea. 15, 16, 17
Is 17² = 15² + 16² ?
17² = 289
15² + 16² = 225 + 256 = 481
NO,
17² < 15² + 16²
Thus,
The triangle is an acute triangle
b. 20, 18, 7
Is 20² = 18² + 7² ?
20² = 400
18² + 7² = 324 + 49 = 373
NO,
20² > 18² + 7²
Thus,
The triangle is an obtuse triangle
a. 17, 144, 145
Is 145² = 144² + 17² ?
145² = 21025
144² + 17² = 20736 + 289 = 21025
YES,
Thus,
The triangle is a right triangle
a. 24, 32, 40
Is 40² = 32² + 24² ?
40² = 1600
32² + 24² = 1024 + 576 = 1600
YES
Hence,
The triangle is a right triangle
Learn more on Classifying triangles here: https://brainly.com/question/27996818
#SPJ1
Unit 10: Circles
Homework 5: Inscribed Angles
** This is a 2-page document! **
Directions: Find each angle or arc measure.
The measure of arc FE is 27degrees,angle m<B is 112degrees, <GHJ = <GIJ = 73⁰ , m<S = 90 degrees in the given circles
The sum of angle in the triangle DEF is 180 degrees
mFE = <D
Recall that <D+<E+<F = 180⁰
<D+63+90 = 180
<D = 180-153
<D = 27 degrees
Hence the measure of arc FE is 27degrees
6) For this circle geometry, we will use the theorem
The sum of Opposite side of a cyclic quadrilateral is 180 degrees.
A + C = 180
m<A + 101 = 180
m<A = 180-101
m<A = 79degrees
Similarly
B + D = 180
m<B + 68 = 180
m<B = 180-68
m<B = 112degrees
7) The sum of angle in a circle is 360, hence;
arcGJ+68+31+115 = 36p
arcGJ = 360 - 214
arcGJ = 146⁰
Since the angle at the centre is twice angle at the circumference, then;
<GHJ = 1/2 arcGJ
<GHJ = 1/2(146)
<GHJ = 73⁰
<GHJ = <GIJ = 73⁰ (angle in the same segment of the circle are equal)
8) Recall that the sum of Opposite side of a cyclic quadrilateral is 180 degrees.
P + R = 180
57 + <R = 180
m<R = 180-57
m<R = 123degrees
Similarly, m<Q+m<S = 180⁰
Since the triangle in a semi circle is a right angled triangle, hence m<Q = 90 degrees (triangle PQR is a right angled triangle)
m<S = 180 - 90
m<S = 90 degrees
To learn more on Circles click:
https://brainly.com/question/11833983
#SPJ1
Find the common difference of the arithmetic sequence 14 , 16 , 18
Answer:
The common difference is 2.
Answer:
The common difference of the arithmetic sequence 14, 16, 18 is **2**.
In any arithmetic sequence, each term is equal to the previous term plus the common difference. So, the second term is equal to the first term plus the common difference. In this case, the second term, 16, is 2 more than the first term, 14. Therefore, the common difference is 2.
We can also find the common difference by subtracting any two consecutive terms in the sequence. For example, we can subtract the second term from the third term to get 18 - 16 = 2.
The common difference of an arithmetic sequence is always constant. This means that the difference between any two consecutive terms in the sequence will always be the same. In this case, the difference between any two consecutive terms is 2.
Step-by-step explanation:
(a) Find the volume of the solid generated by revolving the region bounded by the graph x2=y−2 and 2y−x−2=0 for 0≤x≤1 about y=3.
(b) A force of 9 lb. is required to stretch a spring from its natural length of 6 in. to a length of 8 in. Find the work done in stretching the spring
(i) from its natural length to a length of 10 in.
(ii) from a length of 7 in. to a length of 9 in.
(a) Volume of the solid generated by revolving the region bounded by the graph is 12.422 cubic units.
(b)
(i) The work done in stretching the spring from its natural length to a length of 10 in. is 54 lb.-in.
(ii) The work done in stretching the spring from a length of 7 in. to a length of 9 in. is approximately 13.5 lb.-in.
How to find the volume of the solid generated by revolving the region bounded by the graph?(a) To find the volume of the solid generated by revolving the region bounded by the graph[tex]x^2=y-2[/tex] and 2y-x-2=0 for 0≤x≤1 about y=3, we can use the method of cylindrical shells:
First, we need to find the limits of integration for the radius of the shells. Since we are revolving around y=3, the distance between y=3 and the curve x^2=y-2 will give us the radius of the shell.
Solving for y in [tex]x^2=y-2[/tex], we get[tex]y=x^2+2.[/tex] Substituting this into 2y-x-2=0, we get [tex]x=2y-2y^2-2.[/tex] So the limits of integration for the radius will be from [tex]3-(x^2+2) to 3-(2y-2y^2-2).[/tex]
Next, we need to find the height of the shells. This is simply the length of the interval of integration for x, which is 0 to 1.
So the volume of the solid is given by the integral:
[tex]V = \int (3-(x^2+2)) - (3-(2y-2y^2-2)) dx[/tex] from x=0 to x=1
Simplifying and evaluating the integral, we get:
V ≈ 12.422 cubic units.
Therefore, the volume of the solid generated by revolving the region bounded by the graph [tex]x^2=y-2[/tex] and [tex]2y-x-2=0[/tex] for 0≤x≤1 about y=3 is approximately 12.422 cubic units.
How to find the work done in stretching the spring from its natural length to a length of 10 in?(b) (i) The work done in stretching the spring from its natural length of 6 in. to a length of 10 in. can be found using the formula:
W =[tex](1/2)k(d2^2 - d1^2)[/tex]
where k is the spring constant, d1 is the initial length, and d2 is the final length.
Given that the force required to stretch the spring from its natural length of 6 in. to a length of 8 in. is 9 lb., we can find the spring constant as follows:
k = F/(d2 - d1) = 9/(8-6) = 4.5 lb/in
So the work done in stretching the spring from its natural length of 6 in. to a length of 10 in. is:
W = [tex](1/2)(4.5)(10^2 - 6^2)[/tex]= 54 lb.-in.
Therefore, the work done in stretching the spring from its natural length to a length of 10 in. is 54 lb.-in.
How to find the work done in stretching the spring from a length of 7 in. to a length of 9 in?(ii) To find the work done in stretching the spring from a length of 7 in. to a length of 9 in., we can use the same formula:
W =[tex](1/2)k(d2^2 - d1^2)[/tex]
Using the same spring constant of 4.5 lb/in, the work done is:
W = [tex](1/2)(4.5)(9^2 - 7^2)[/tex]≈ 13.5 lb.-in.
Therefore, the work done in stretching the spring from a length of 7 in. to a length of 9 in. is approximately 13.5 lb.-in.
Learn more about volume of the solid
brainly.com/question/12649605
#SPJ11
Let, E = [u1, u2, u3] and F = [b1, b2], where u1 = (1, 0, - 1)T, u2 = (1, 2, l)T, u3 = ( - l, l, l)T and b1 = (l, - l)T, b2 = (2, - l)T. For each of the following linear transformations L from R3 into R2, find the matrix representing L with respect to the ordered bases E and F
The matrix representing L with respect to the ordered bases E is [ 0 5 3l ][ -2 l -3l ]. The matrix representing L with respect to the ordered bases F is [ 1 l -l/2 ] [ -1 1 3/2 ].
To find the matrix representing the linear transformation L with respect to the ordered bases E and F, we need to determine where L sends each vector in the basis E and express the results as linear combinations of the basis vectors in F. We can then arrange the coefficients of these linear combinations in a matrix.
Let's apply this approach to each of the given linear transformations:
L(x, y, z) = (x + y, z)
To find the image of u1 = (1, 0, -1)T under L, we compute L(u1) = (1 + 0, -1) = (1, -1). Similarly, we can compute L(u2) = (3, l) and L(u3) = (-l, 3l). Now we express each of these images as a linear combination of the vectors in F:
L(u1) = 1*b1 + (-1/2)b2
L(u2) = lb1 + (1/2)*b2
L(u3) = (-l/2)*b1 + (3/2)*b2
These coefficients give us the matrix:
[ 1 l -l/2 ]
[ -1 1 3/2 ]
L(x, y, z) = (x + 2y - z, -x - y + 3z)
Using the same process, we find:
L(u1) = (0, -2)
L(u2) = (5, l)
L(u3) = (3l, -3l)
Expressing these images in terms of E gives the matrix:
[ 0 5 3l ]
[ -2 l -3l ]
Know more about matrix here:
https://brainly.com/question/29132693
#SPJ11
Logan has 9 pounds of trail mix. he will repackage it in small bags of 1/2 pound each. How many bags can he make?
Answer:
9÷ 1/2 = 9 • 2/1 = 18 bags of trail mix
Step-by-step explanation:
You can solve this problem using division. Since there are 9 pounds of trail mix to divide up, you would start with 9 pounds and divide it by 1/2 pound to find the number of bags you could make (use the reciprocal of the divisor 1/2)
Practice
Compare. Use >, <, or = to make a true statement
30 ounces o 2 pounds
After unit conversion , the statement is 30 ounces < 2 pounds.
What is unit conversion?
The same feature is expressed in a different unit of measurement through a unit conversion. Time can be stated in minutes rather than hours, and distance can be expressed in kilometres rather than miles, or in feet rather than any other unit of length.
Here the given is 32 ounces and 2 pounds,
We know that , if two values in same measurement then we can easily compare them.
Here we know that 1 pound = 16 ounces. Then
=> 2 pounds = 16*2 = 32 ounces.
Hence the statement is 30 ounces < 2 pounds.
To learn more about unit conversion refer the below link
https://brainly.com/question/13016491
#SPJ9
problem 6. show that if ab = ac and a is nonsingular, then the cancellation law holds; that is, b = c.
To show that if ab = ac and a is nonsingular, then the cancellation law holds, meaning b = c, we can follow these steps:
1. Start with the given equation: ab = ac.
2. We know that a is nonsingular, which means it has an inverse, denoted by a^(-1).
3. Multiply both sides of the equation by the inverse of a on the left: a^(-1)(ab) = a^(-1)(ac).
4. Use the associative property of matrix multiplication: (a^(-1)a)b = (a^(-1)a)c.
5. The product of a matrix and its inverse is the identity matrix (I): Ib = Ic.
6. The identity matrix doesn't change the matrix when multiplied: b = c.
Thus, by using the given terms "nonsingular," "cancellation law," and "b = c," we have shown that if ab = ac and a is nonsingular, then the cancellation law holds, and b = c.
Learn more about the cancellation law :
https://brainly.com/question/31328698
#SPJ11
Its an 8th grade SBA review
hope you guys can help me •DUE ON APRIL 11
5. There is no solution since 5 = 7 is a false statement. Option C
6. There is no solution since 7x = 6x is a false statement. Option C
7. The value of the angle BCY = 55 degrees
8. The value of exterior angle , x is 137 degrees
How to determine the valuesNote that algebraic expressions are described as expressions composed of variables, terms, constants, factors and constants.
From the information given, we have that;
5. 6x +8 - 3 = 8x + 7 -2x
collect the like terms
6x + 5 = 6x + 7
5 = 7
6. 9x + 11 - 2x = 6x + 11
collect the terms
7x = 6x
We can see that for the value of the first, x is zero and for the second, there is no solution
7. We have from the diagram that;
25x + 11x = 180; because angles on a straight line is equal to 180 degrees
add the like terms
36x = 180
Make 'x' the subject of formula
x = 5
<BCY = 11x = 11(5) = 55 degrees
8. The sum of the angles in a triangle is 180 degrees
Then,
62 + 61 + y = 180
y = 180 - 43
But, x + y = 180
x = 180 - 43 = 137 degrees
Learn about triangles at: https://brainly.com/question/14285697
#SPJ1
Q- 6
Triangle NMO is drawn with vertices N(−5, 2), M(−2, 1), O(−3 , 3). Determine the image vertices of N′M′O′ if the preimage is reflected over x = −5.
N′(5, 2), M′(2, 1), O′(3, 3)
N′(2, −5), M′(1, −2), O′(3, −3)
N′(0, 2), M′(3, 1), O′(2, 3)
N′(−5, 2), M′(−8, 1), O′(−7, 3)
The vertices of the triangle after reflection is
D)N′(−5, 2), M′(−8, 1), O′(−7, 3).
What is triangle?
A triangle is a form of polygon with three sides; the intersection of the two longest sides is known as the triangle's vertex. There is an angle created between two sides. One of the crucial elements of geometry is this
Remember that the general rule to reflect over a vertical line in the form
if x = a then,
=> (x , y) -> (-x-2a , y)
For x = 5, we'll have that the general rule is:
=> (x , y) -> (-x-10 , y).
Now the triangle vertices are,
N(-5,2) => (-(-5)-10,2) => (5-10 , 2) => N'(-5,2)
M(-2,1) => (-(-2)-10,1) => (2-10,1) => M' (-8,1)
O(-3,3) => (-(-3)-10,3) => (3-10,3) => O'(-7,3)
Hence the vertices of the triangle after reflection is D)N′(−5, 2), M′(−8, 1), O′(−7, 3).
To learn more about triangle refer the below link
https://brainly.com/question/17335144
#SPJ1
At the city museum, child admission is $5.60. and adult admission is $9.40. On wensday, 177 tickets were sold for a total of $1352.20. how many adult tickets were sold that day?
Let's use variables to represent the number of child and adult tickets sold on Wednesday.
Let c be the number of child tickets sold, and let a be the number of adult tickets sold.
We know that the price of a child ticket is $5.60, and the price of an adult ticket is $9.40.
From the problem statement, we know that 177 tickets were sold in total, so:
c + a = 177
We also know that the total revenue from ticket sales was $1352.20, so:
5.60c + 9.40a = 1352.20
Now we have a system of two equations with two variables. We can solve for a by using the first equation to express c in terms of a, and then substituting into the second equation:
c + a = 177 --> c = 177 - a
5.60c + 9.40a = 1352.20
Substituting c = 177 - a into the second equation, we get:
5.60(177 - a) + 9.40a = 1352.20
Expanding and simplifying:
992.20 - 5.60a + 9.40a = 1352.20
3.80a = 360
a = 95
Therefore, 95 adult tickets were sold on Wednesday.
Its bugging out but I got 95 tickets I would add explanation if it didn't act out.
X=Adult tickets
Y=Child tickets
X+Y=117
Y=117-X
9.40X+5.60Y=1352.20
9.40X+5.60(117-X)=1352.20
9.40X+991.20-5.60x=1352.20
3.80X=361
X=95
Use Pythagoras' theorem to work out the length of the hypotenuse in the triangle on the right, below.
Give your answer in centimetres (cm) and give any decimal answers to 1 d.p.
This is an exercise of the Pythagorean Theorem, which establishes that in every right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides, called legs.
This can be expressed mathematically as:
c = √(a² + b²) ⇔ a² + b² = c²Where "a" and "b" are the lengths of the legs and "c" is the length of the hypotenuse. This theorem is one of the fundamental bases of geometry and has many applications in physics, engineering, and other areas of science.
The Pythagorean Theorem formula is used to calculate the length of an unknown side of a right triangle, as long as the lengths of the other two sides are known. It can also be used to determine if a triangle is right if the lengths of its sides are known.
To calculate the hypotenuse, we will apply the formula:
c = √(a² + b²)
Knowing that:
a = 8cm
b = 15cm
Now we just substitute the data in the formula, and calculate the hypotenuse, then
c = √(a² + b²)c = √((8 cm)² + (15 cm)²)c = √(64 cm² + 225 cm²c = √(289 cm²)c = 17 cmThe hypotenuse C of the triangle is 17 cm.
ヘ( ^o^)ノ＼(^_^ )If you want to learn more about mathematics, I share this link to complement your learning:
https://brainly.com/question/29085128
find the taylor polynomial of degree 4 for cos(x), for x near 0: p4(x)= approximate cos(x) with p4(x) to simplify the ratio: 1−cos(x)x= using this, conclude the limit: limx→01−cos(x)x=
As x approaches to 0, x²/8 approaches 0 the limit is 1/2 and the taylor polynomial for cos(x), for x near 0 is (x²/2 - x⁴/24)/x
To find the Taylor polynomial of degree 4 for cos(x) near x = 0, we use the following formula:
p4(x) = cos(0) - (x²/2!) + (x⁴/4!) = 1 - (x²/2) + (x⁴/24)
To simplify the ratio (1-cos(x))/x, we substitute cos(x) with p4(x):
(1 - (1 - (x²/2) + (x⁴/24)))/x = (x²/2 - x⁴/24)/x
Now, to find the limit as x approaches 0:
lim (x->0) (x²/2 - x⁴/24)/x = lim (x->0) (x/2 - x³/24)
Using L'Hopital's rule, we differentiate the numerator and the denominator with respect to x:
lim (x->0) (1/2 - x²/8)
To know more about Taylor polynomial click on below link:
https://brainly.com/question/31419648#
#SPJ11
Need help asap due today!
Thank you so much if you help!!
Find the circumference”
Answer:
37.68
Step-by-step explanation:
The formula for getting the circumference of a circle is 2πr
So:
2 * 3.14 * 6
= 37.68
Hope this helps :)
Pls brainliest...
construct a 95onfidence interval for the population variance σ2 if a sample of size 25 has standard deviation s = 14. round the answers to two decimal places.
We can say with 95% confidence that the population variance σ2 lies within the interval [155.25, 570.06].
To construct a 95% confidence interval for the population variance σ2, we can use the chi-square distribution.
First, we need to calculate the chi-square values for the upper and lower limits of the confidence interval. We use the formula:
chi-square upper = (n-1)*s^2 / χ^2(α/2, n-1)
chi-square lower = (n-1)*s^2 / χ^2(1-α/2, n-1)
where n is the sample size, s is the sample standard deviation, α is the level of significance (0.05 for 95% confidence interval), and χ^2 is the chi-square distribution function.
Plugging in the values, we get:
chi-square upper = (25-1)*14^2 / χ^2(0.025, 24) = 43.98
chi-square lower = (25-1)*14^2 / χ^2(0.975, 24) = 15.14
Next, we can use these chi-square values to calculate the confidence interval for σ2:
confidence interval = [(n-1)*s^2 / chi-square upper, (n-1)*s^2 / chi-square lower]
Plugging in the values, we get:
confidence interval = [(25-1)*14^2 / 43.98, (25-1)*14^2 / 15.14]
confidence interval = [155.25, 570.06]
Learn more about standard deviation here: brainly.com/question/23907081
#SPJ11
Learn
Dotebook
1. Mario has 12 boxes of pizza He cut each pizza into eights. How mar
pieces of pizza will there be?
Answer: 96 slices
Step-by-step explanation:
which equations are true? Select the four correct answers. A. 3/4=6/8 B. 4/6=10/12 C. 2/3=8/12 D. 8/8=5/5 E. 2/5=4/10 F. 1/4=5/8
Answer:
The Correct answers are
A
C
D
E
Answer:
Correct Answers:
A 3/4=6/8
C 2/3=8/12
D 8/8=5/5
E 2/5=4/10
Step-by-step explanation:
An artist is creating a scale drawing of a mural in the shape of a right triangle she will paint for the city. Her drawing is 8 inches long and has a hypotenuse of 15 inches. If the mural has a hypotenuse of 96 inches, how long is the mural?
Answer:
51.2 inches
Step-by-step explanation:
You want the length of a mural whose hypotenuse is 96 inches if the scale drawing has a length of 8 inches and a hypotenuse of 15 inches.
RatiosThe ratios of corresponding lengths will be the same:
drawing length / drawing hypotenuse = mural length / mural hypotenuse
8 in / 15 in = mural length / 96 in
SolutionMultiplying the equation by 96 in, we have ...
(96 in)·8/15 = mural length
51.2 in = mural length
The mural is 51.2 inches long.
Suppose a random variable X is Poisson with E(X) = 2.4. Find the probability that X will be at least 2, and the probability that X will be between 2 and 4 (inclusive). P(X > 2) = | P(2 < X < 4) = Use a probability calculator and give the answer(s) in decimal form, rounded to four decimal places.
The probability that X will be at least 2 is 0.5940 and the probability that X will be between 2 and 4 (inclusive) is 0.3010.
How to find the probability that X will be at least 2 and the probability that X will be between 2 and 4?The Poisson distribution is given by the formula:
[tex]P(X = k) = (e^{(-\lambda)} * \lambda ^k) / k![/tex]
where λ is the expected value or mean of the distribution.
In this case, we are given that E(X) = 2.4, so λ = 2.4.
Using a Poisson probability calculator, we can find:
P(X > 2) = 1 - P(X ≤ 2) = 1 - (P(X = 0) + P(X = 1) + P(X = 2))
= [tex]1 - [(e^{(-2.4)} * 2.4^0) / 0! + (e^{(-2.4)} * 2.4^1) / 1! + (e^{(-2.4)} * 2.4^2) / 2!][/tex]
= [tex]1 - [(e^{(-2.4)} * 1) + (e^{(-2.4)} * 2.4) + (e^{(-2.4)} * 2.4^2 / 2)][/tex]
= 1 - 0.4060
= 0.5940 (rounded to four decimal places)
Therefore, the probability that X will be at least 2 is 0.5940.
Using a Poisson probability calculator, we can find:
P(2 < X < 4) = P(X = 3) + P(X = 4)
= [tex](e^{(-2.4)} * 2.4^3 / 3!) + (e^{(-2.4)} * 2.4^4 / 4!)[/tex]
= 0.2229 + 0.0781
= 0.3010 (rounded to four decimal places)
Therefore, the probability that X will be between 2 and 4 (inclusive) is 0.3010.
Learn more about poisson distribution
brainly.com/question/17280826
#SPJ11
Marginal Utility Consider the utility function: u(x1, 12) = x2 + x2(a) What is the marginal utility function with respect to 3? What is the marginal utility function with respect to x2? Make sure to write out the expressions as LTEX formulas. (b) Given your results in (a), what is significant about this utility function?
In economics, a utility function is a mathematical function that assigns a numerical value to the satisfaction or utility that a consumer derives from consuming a particular combination of goods and services.
First, let's correct the utility function you provided. I believe it should be:
u(x1, x2) = x1^2 + x2^2
Now, let's find the marginal utility functions with respect to x1 and x2. The marginal utility is the derivative of the utility function with respect to the corresponding variable.
(a) Marginal utility function with respect to x1:
MU_x1 = d(u(x1, x2))/dx1 = 2x1
Marginal utility function with respect to x2:
MU_x2 = d(u(x1, x2))/dx2 = 2x2
(b) The significance of this utility function is that it exhibits diminishing marginal utility for both x1 and x2. As the consumption of x1 or x2 increases, the additional utility gained from consuming more units of x1 or x2 decreases.
This is evident in the marginal utility functions MU_x1 and MU_x2, where the derivatives are constant values (2x1 and 2x2), indicating a linear relationship.
To learn more about “marginal utility” refer to the https://brainly.com/question/15050855
#SPJ11
Work out the area of this semicircle. Take to be 3.142 and give your answer to 2 decimal places. Diameter is 8cm.
Answer:
3.142 in 2 decimal is 3.100
Step-by-step explanation:
When we come to diameter of 8cm I don't know
find the points of intersection of the line x = 5 3t, y = 7 8t, z = −4 t, that is, l(t) = (5 3t, 7 8t, −4 t), with the coordinate planes. xy plane (x, y, z)
The line intersects the xy-plane (z=0) and the xz-plane (y=0) at the point (0,0,0) in both cases.
To find the point of intersection of the line l(t) = (5/3t, 7/8t, -4t) with the xy-plane (z=0), we can putting z=0 in the equation of the line to get
5/3t = x
7/8t = y
0 = z
Solving for t, we get
t = 0 (which corresponds to the point (0,0,0))
Substituting t=0 in the equations of the line, we get the point of intersection as
(5/3(0), 7/8(0), -4(0)) = (0, 0, 0)
Therefore, the line intersects the xy-plane at the point (0, 0, 0).
To find the point of intersection of the line with the xz-plane (y=0), we can substitute y=0 in the equation of the line to get
5/3t = x
0 = y
-4t = z
Solving for t
t = 0 (which corresponds to the point (0,0,0))
Putting t=0 in the equations of the line, we get the point of intersection as
(5/3(0), 7/8(0), -4(0)) = (0, 0, 0)
Therefore, the line intersects the xz-plane at the point (0, 0, 0).
To know more about points of intersection:
https://brainly.com/question/31384612
#SPJ4
Determine the form of a particular solution to the differential equations. Do not solve. (a) x" — x' – 2x = e^t cost – t^2 + cos 3t (b) y" – y' + 2y = (2x + 1)e^(x/2) cos (√7/2)x + 3(x^3 – x)e^(x/2) sin (√7/2) x
The form of the particular solution of the differential equation x" — x' – 2x = e^t cost – t^2 + cos 3t is x_p(t) = Ae^t cos(t) + Be^t sin(t) + Ct^2 + Dt + Ecos(3t) + Fsin(3t) and the particular solution of the y" – y' + 2y = (2x + 1)e^(x/2) cos (√7/2)x + 3(x^3 – x)e^(x/2) sin (√7/2) x is y_p(x) = (Ae^(x/2) cos(√7/2)x + Be^(x/2) sin(√7/2)x) + (C x^3 + Dx^2 + Ex + F)
Explanation: -
Part (a): -To determine the form of a particular solution to x" - x' - 2x = e^t cos(t) - t^2 + cos(3t),
we look at the non-homogeneous terms on the right-hand side. We see that we have a term of the form e^t cos(t), which suggests a particular solution of the form Ae^t cos(t) or Be^t sin(t).
We also have a polynomial term t^2, which suggests a particular solution of the form At^2 + Bt + C. Finally, we have a term of the form cos(3t), which suggests a particular solution of the form D cos(3t) + E sin(3t).
Thus,
x_p(t) = A e^t cos(t) + B e^t sin(t) + Ct^2 + Dt + E cos(3t) + F sin(3t) is particular solution of the above differential equation.
Part (b): -To determine the form of a particular solution to y" - y' + 2y = (2x + 1)e^(x/2) cos(√7/2)x + 3(x^3 - x)e^(x/2) sin(√7/2)x, we first observe that the right-hand side includes a product of exponential and trigonometric functions. Therefore, a particular solution may take the form of a linear combination of functions of the form e^(ax) cos(bx) and e^(ax) sin(bx).
Additionally, the right-hand side includes a polynomial of degree 3, so we may include terms of the form ax^3 + bx^2 + cx + d in our particular solution.
Overall, a possible form for a particular solution to this differential equation is:
y_p(x) = (Ae^(x/2) cos(√7/2)x + Be^(x/2) sin(√7/2)x) + (C x^3 + Dx^2 + Ex + F)
Know more about the "Particular solution" click here:
https://brainly.com/question/15127193
#SPJ11
On a recent quiz, the class mean was 73 with a standard deviation of 3.1. Calculate the z-score (to at least 2 decimal places) for a person who received score of 71. Z-Score: ____Is this unusual? A. Unusual B. Not Unusual
The, a z-score of -0.65 is not unusual
To calculate the z-score, we use the formula:
[tex]z =\frac{ (x - μ)}{σ}[/tex]
where x is the individual score, μ is the mean, and σ is the standard deviation.
Plugging in the values given, we get:
[tex]z= \frac{71-73}{3.1}[/tex]
z = -0.65
Rounding to 2 decimal places, the z-score is -0.65.
To determine if this score is unusual or not, we need to compare it to the normal distribution. A z-score of -0.65 means that the individual's score is 0.65 standard deviations below the mean.
According to the empirical rule, about 68% of the data falls within 1 standard deviation of the mean. Therefore, a z-score of -0.65 is not unusual and falls within the normal range of scores.
So, the answer is B. Not Unusual.
To know more about "mean" refer here:
https://brainly.com/question/31101410#
#SPJ11