in a survey, 24 people were asked how much they spent on their child's last birthday gift. the results were roughly bell-shaped with a mean of $35 and standard deviation of $15. construct a confidence interval at a 90% confidence level.
The confidence interval at a 90% is 29.533 ≤ μ ≤ 40.467
Given that
mean = 35
standard deviation = 15
We compute the confidence interval as follows:
μ =¯ˣ± ME
Where:
μ = is the population mean,¯x = 35 is the sample mean and,ME = is the margin of error.To calculate the margin of error, we will use the t-distribution since the sample is very small n<30. Thus, our margin of error will be calculated as:
ME = t ×[tex]\frac{s}{\sqrt{n} }[/tex]
Where:
t = is the t-score at the 90% confidence level
degree of freedom df = 24 -1 =23
s = 15 is the standard deviation and,
n =24 is the sample size.
From the t-distribution tables, we will read the values of t at a critical value [tex]\alpha[/tex] = 0.10, and the degree of freedom is 23. This will give t= 1.714.
Thus, the margin of error is:
ME = 1.714 ×[tex]\frac{15}{\sqrt{23} }[/tex]
ME = 1.714 ×3.19
ME = 5.467
the confidence interval for the population mean is equal to:
μ = 35 ± 5.467
29.533 ≤ μ ≤ 40.467
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Which graph represents f(x)=5⋅3x?
Answer:
the first one, the top left corner
Step-by-step explanation:
y- int = 5
no x int
Body-mass index, or BMI, takes both weight and height into account when assessing whether an individual IS
underweight or overweight. BMI varies directly as one's weight, in pounds, and inversely as the square of one's height,
in inches. In adults, normal values for the BMI are between 20 and 25, inclusive. Values below 20 indicate that an
individual is
underweight and values above 25 indicate that an individual is overweight. A person who weighs 180
pounds and is 5 feet, or 60 inches, tall has a BMI of 35.15. Use the four-step procedure for solving variations to
determine what the BMI is, to the nearest tenth, for a 210-pound person who is 5 feet 9 inches tall. Is this person
underweight, normal, or overweight?
The person is overwieght as his BMI is 31.00 (approx)
What is Proportion?
In general, proportion refers to a part, share, or quantity assessed in comparison to a total. According to the notion of proportion, two ratios are in proportion when they are equivalent. It is a formula or statement that shows that two ratios or fractions are equivalent.
Solution:
Since, BMI is directly proportionate with weight and indirectly proportionate with square of height, we need to use a constant to make proportion to an equation.
According to the question,
BMI of a person who weighs 180 pounds and is 5 feet tall is 35.15.[tex]BMI = k*weight/height^{2}[/tex]
here, k is any constant value
35.15 = k*180/(60*60)
(35.15 * 3600)/180 = k
k = 703
Calculating BMI of a person weighing 210 pound and is 5 feet 9 inch tall.
First of all we need to convert 5 feet 9 inches into inches
5 feet = 60 inches
so, 5 feet 9 inch means 69 inches
BMI = 210*703/(69*69)
BMI = 31.00 (after rounding off)
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can someone please help me?
Answer:
b i think
Step-by-step explanation:
becuase 45f in total and for every hour it decreses 2f the anwser would be b but i may be wrong
A waitress sold 19 ribeye steak dinners and 12 grilled salmon dinners, totaling $581.52 on a particular day. Another
day she sold 24 ribeye steak dinners and 6 grilled salmon dinners, totaling $581.59. How much did each type of
dinner cost?
The each type of dinner cost is ribeye steak dinner cost is $20.05 and grilled salmon dinner cost is $16.74 by using the equation.
Given that,
On one particular day, a waitress served 12 grilled salmon dinners and 19 ribeye steak dinners for a total of $581.52. She made $581.59 on another day by selling 24 ribeye steak dinners and 6 grilled salmon entrees.
We have to find what was the price of each kind of dinner.
So,
We take R as a ribeye steak dinner and S as grilled salmon dinners.
We get,
19R+12S=$581.52 ---> equation(1).
24R+6S=$581.59 ----> equation(2).
Now Take the equation (2)
24R+6S=$581.59
6S=$581.59-24R
Multiply 2 on both sides of equation.
12S=$1163.18-48R
Now take the equation(1)
19R+12S=$581.52
Take the 12S as 12S=$1163.18-48R
19R+$1163.18-48R=$581.52
-29R=$581.52-$1163.18
-29R=-581.66
29R=581.66
R=581.66/29
R= $20.05
Now substitute R in 12S=$1163.18-48R
We get,
12S=$1163.18-48($20.05)
12S=$1163.18-962.4
12S=200.78
S=200.78/12
S=$16.74
Therefore, The each type of dinner cost is ribeye steak dinner cost is $20.05 and grilled salmon dinner cost is $16.74 by using the equation.
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In the coordinate plane, line p has slope 8 and y-intercept (0, 5). Line r is the result of dilating line p by a factor of 3 with center (0, 3). What are the slope and y-intercept of line r?.
In the given coordinate plane, based on the given dilation the line r has slope 8 and coordinate (0,8)
Dilation:
Dilation refers the ratio of the given line to line by the scale factor.
Given
In the coordinate plane, line p has slope 8 and y-intercept (0, 5). Line r is the result of dilating line p by a factor of 3 with center (0, 3).
Here we need to find the the slope and y-intercept of line r.
Here we know that scale factor is 3.
Let us consider the slope of the line r will not change and the intercept is the addition of their ordinate will be.
So, it can be written as,
=> Intercept = 5 + 3
=> Intercept = 8
Therefore, the line r has slope 8 and coordinate (0.8).
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Identify a reasonable domain and range.
Tickets that cost $125 dollars each
Well the domain is the number of tickets and the range is the cost for those tickets.
So x = 1 when y = 125 (1 ticket is 125 dollars). Here is a reasonable domain and range comparision:
x = 1 , y = 125
x = 2, y = 250
x = 3, y = 375
x = 4, y = 500
ect...
The lower limit of the domain is 0 because you cannot have less than 0 tickets.
I hope this helps!
suppose the true proportion of voters in the county who support a restaurant tax is 0.55. consider the sampling distribution for the proportion of supporters with sample size n
The mean of this distribution is 0.55
The standard error of this distribution is 0.0384
We have the following:
p=0.55
sample size, n=168
Mean of distribution:
Mean=true proportion of voters who support a restaurant
Mean=p=0.55
Hence, the mean of distribution is 0.55
Standard error of the distribution:
[tex]=\sqrt{\frac{p(1-p)}{n} }[/tex]
[tex]=\sqrt{\frac{0.55(1-0.55)}{168} }[/tex]
=0.0384
Hence, the standard error is 0.0384
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The questions was incomplete, the complete question is given below:
Suppose the true proportion of voters in the county who support a restaurant tax is 0.55. Consider the sampling distribution for the proportion of supporters with sample size n = 168.
What is the mean of this distribution?
What is the standard error of this distribution?
In the equation, what is the value of s?
3(s + 1) − 8 = 6s(2 − 4)
Answer:
[tex]\boxed{\boxed{\sf s=\frac{1}{3}}\sf \:or\:\boxed{\sf s=0.33...}}[/tex]
Step-by-step explanation:
[tex]\sf 3\left(s+1\right)-8=6s\left(2-4\right)[/tex]
Expand ( Apply the Distributive Property):-
[tex]\sf 3s-5=-12s[/tex]
Add 5 to both sides:-
[tex]\sf 3s-5+5=-12s+5[/tex]
Simplify:-
[tex]\sf 3s=-12s+5[/tex]
Add 12s to both sides:-
[tex]\sf 3s+12s=-12s+5+12s[/tex]
Simplify:-
[tex]\sf 15s=5[/tex]
Divide both sides by 15:-
[tex]\sf \cfrac{15s}{15}=\cfrac{5}{15}[/tex]
Simplify:-
[tex]\sf s=\cfrac{1}{3}[/tex]
___________________
Hope this helps!
Have a great day! :)
show that, if the wait() and signal() semaphore operations are not executed atomically, then mutual exclusion may be violated.
If the wait() and signal() semaphore operations are not executed atomically, then mutual exclusion may be violated as a wait operation atomically decrements the value associated with a semaphore.
Semaphores refers to integer variables utilized to solve the critical section problem by using two atomic operations, wait and signal that are used for process synchronization. The wait operation decreases the value of its argument S, if it is positive and if S is negative zero or negative, then no operation occurs. The signal operation increases the value of its argument S. Operation wait() and signal() must be completely atomic or else it violates the mutual exclusion. Mutual exclusion refers to the property of process synchronization which asserts that “no two processes can exist in the critical section at any given point of time”.
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A 3/8-pound piece of cheese contains 4 servings. How much cheese is in 1 serving?
Answer:
3/32-pound cheese in 1 serving
Step-by-step explanation:
(3/8)/4=3/32 or 0.09375 lbs
The population of a specific species of nocturnal mammal is decreasing at a rate of 3.5%/year. The graph models the number of mammals x years after they were originally counted.
Identify and interpret the key features of the exponential function modeled in terms of this situation.
Select each correct answer.
Question 1 options:
The y-intercept represents the number of mammals when they were originally counted.
The line y = 0 is an asymptote of the graph.
The y-intercept.is 75.
The y-intercept is 120.
The asymptote indicates that the number of mammals counted when the study began was 120.
The asymptote indicates that as years pass, the number of mammals will approach 0.
The line x = 0 is an asymptote of the graph.
The key features of the graph of the exponential function are given as follows:
The y-intercept represents the number of mammals when they were originally counted.The y-intercept is 120.The line y = 0 is an asymptote of the graph.The asymptote indicates that as years pass, the number of mammals will approach 0.What are the key features of the graph?The y-intercept of a function gives the value of the function when it crosses the y-axis, that is, when x = 0, hence it is the initial number of mammals, which is of 120.
As x goes to infinity, the number of mammals will never be of zero but it will get very close to zero, hence the line y = 0 is the horizontal asymptote of the graph.
Missing InformationThe graph is shown by the image given at the end of the answer.
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Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. Release your mouse button when the item is placed. If you change your mind, drag the item to the trashcan. Click the trashcan to clear all your answers.
Write the expression in exponential form.
log₆ M = y
Choose the graph of Y=1/2|x|+3
What type of angles are < 3 and < 6
Answer:
Obtuse Angles
Step-by-step explanation:
Both < 3 and < 6 are visibly over 90° and less than 180°, so both are obtuse.
What is the equation for the constant of proportionality that
matches the table?
y = 9x
y=18x
y = Ox
y = x
Answer:
y=9x
Step-by-step explanation:
For these x's and y's, we can notice that y is always equal to 9 times the value of x. 0 equals 9 * 0, 9 equals 9 * 1, 18 equals 9 * 2, 27 equals 9 * 3, and 36 equals 9 * 4.
We have just shown that y equals 9 times x, which is just y=9*x, or y=9x.
h - 2 > 10; h = 12
is that true?
Answer:
no, h=anything greater than 12
Step-by-step explanation
Answer:
No. It is false.
Step-by-step explanation:
h - 2 > 10; h = 12
Substitute 12 in place of h.
12 - 2 >? 10
Simplify.
10 >? 10
10 is NOT > 10
10 is not greater than 10. 10 is equal to 10. If the symbol had the "or equal to" underline under it, then it would be true. See image.
9y + 4.1 -6y someone help me on this question
Answer:
3y + 4.1
Step-by-step explanation:
You can't add unlike terms, so you collect like terms:
9y - 6y + 4.1
= 3y + 4.1
Find the zeros of the function. Enter the solutions from least to greatest.
f(x) = (x+8)² - 1
lesser x =
greater x =
The zeroes of the polynomial is -7,-9 and the lesser x = -9, greater x = -7.
What is zeroes of polynomial?
We already know that a polynomial is an algebraic term with one or many terms. Zeroes of Polynomial are the real values of the variable for which the value of the polynomial becomes zero. So, real numbers, ‘m’ and ‘n’ are zeroes of polynomial p (x), if p (m) = 0 and p (n) = 0.
Given
f(x) = (x+8)² - 1
=x^2+64+16x-1
=x^2+16x+63
=x^2+7x+9x+63
=x(x+7)+9(x+7)
=(x+7)(x+9)
therefore, x=-7,-9
The lesser x = -9,
the greater x = -7.
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pls explain how to do this
The x value for each of the equation.
1)The x is 10 when the equation is 8=x-2
2)If x+2=-2, then the value of x is -4.
3)If 2=x+8, then the value of x is -6.
4)The x is -10 when the equation is x+8=-2
Given that,
The given equation are
1) 8=x-2
2) x+2=-2
3) 2=x+8
4)x+8=-2
We have to find the x value for each of the equation.
Take the equations,
1) 8=x-2
Adding 2 on both sides
8+2=x-2+2
10=x
The x is 10 when the equation is 8=x-2
2) x+2=-2
Adding 2 on both sides
x+2+2=-2+2
x+4=0
Adding -4 on both side
x+4-4=0-4
x=-4
If x+2=-2, then the value of x is -4.
3) 2=x+8
Subtracting 8 on both sides
2-8=x+8-8
-6=x
x=-6
If 2=x+8, then the value of x is -6.
4)x+8=-2
Adding -8 on both sides
x+8-8=-2-8
x=-10
The x is -10 when the equation is x+8=-2
Therefore, the x value for each of the equation.
1)The x is 10 when the equation is 8=x-2
2)If x+2=-2, then the value of x is -4.
3)If 2=x+8, then the value of x is -6.
4)The x is -10 when the equation is x+8=-2
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The graph represents the number y of computers infected by a virus after x hours. Find the number of computers infected after 90 minutes and after 6 hours.
Examining the given graph the number of computers infected in
90 minutes = 8 computers6 hours = 4096 computersHow to find the number of computers infectedThe graph shows that the function is an exponential function
represented as
The starting term of the function f(x) = 4^t is 1, and base is 4
f(x) = number of computer infected
t = time in hours
90 minutes in hours
90 / 60 = 1.5 hours
for t = 1.5 hours
f(x) = 4^1.5
f(x) = 8
for t = 6 hours
f(x) = 4^6
f(x) = 4096
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What is the first step to find the volume of the solid?
Answer: c
Step-by-step explanation:
g(x) is a vertical shift of f(x) , as shown in the graph. How do the two equations relate to each other?
Answer:
A
Step-by-step explanation:
g(x) = f(x) + 3
A 3 gallon bucket of paint costs $116.64. What is the price per cup?
Answer:
Step-by-step explanation:
You can use proportions to solve this.
You are paying $116.64 for 3 gallons of paint, so you could write this as:
\frac{116.64}{3}
Since the question is asking for price PER CUP, you want to convert 3 gallons to cups. 3 gallons = 48 cups. So now you can rewrite this as:
\frac{116.64}{48 cups}
In order to find the cost per cup, you can set up a proportion that solves for the price, x
\frac{116.64}{48 cups} = \frac{x}{1 cup}
Solve for x by cross multiplying:
48x = 116.64
x = $2.43
It costs $2.43 per cup of paint
Which graph represents the function
f(x)=√x+3-4
Answer:
I believe it is the last option but I'm not completely sure because the pic is blurry. But if the beginning of the graph is at (-3, -4) then the last option is definitely correct.
Step-by-step explanation:
Remember h controls horizontal movement k controls vertical movements.
always remember to take the opposite of h.
;)
(b) The amount of pure acid in 40 oz of 15% acid solution is
(Type an integer or a decimal.)
OZ.
Using the percentage, the amount of pure acid in 40 oz of 15% acid solution is 6 OZ.
In the given question,
The amount of pure acid in 40 oz of 15% acid solution is in OZ.
As we know that percentage is represent as a ratio of 100. So we solve it by converting the percentage.
So
=40×15%
So the simplified form is
=40×15/100
Simplifying
=6
Hence, the amount of pure acid in 40 oz of 15% acid solution is 6 OZ.
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Write 180 as a product of primes. Use index notation when giving your answer.
Answer: 5x2x2x3x3 is the answer to your question
an anonymous survey of college students was taken to determine behaviors regarding alcohol, cigarettes, and illegal drugs. the results were as follows:837 drank alcohol regularly, 639 smoked cigarettes, 176 used illegal drugs, 388 drank alcohol regularly and smoked cigarettes, 100 drank alcohol regularly and used illegal drugs, 105 smoked cigarettes and used illegal drugs, 83 engaged in all three behaviors, and 358 engaged in none of these behaviors. a) how many students were surveyed? of those surveyed, b) how many drank alcohol or smoked cigarettes ? c) how many drank alcohol only? d) how many drank alcohol and smoked cigarettes , but did not use illegal drugs ? e) how many smoked cigarettes or used illegal drugs , but did not drink alcohol ? f) how many engaged in exactly two of these behaviors? g) how many engaged in at least one of these behaviors?
a) Total surveyed students=1500
b) Drank alcohol or smoked cigarettes=1088.
c) Drank alcohol only=432
What is Venn Diagram?
A Venn diagram employs circles or other shapes that overlap to show the logical connections between two or more groups of objects. They frequently serve to visually group objects while highlighting how they differ and how they are similar.
Given, Alcohol drank → 857
Smoked cigarettes → 639
Illegal drugs used → 176
Drank alcohol regularly and smoked cigarettes → 388
Drank alcohol regularly and used illegal drugs →100
Smoked cigarettes and used illegal drugs → 105
Engaged in all three behaviors → 83
Engaged for none of these → 358
Notation used, Alcohol (A), Drugs (D), Cigarettes (C)
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3- (pogil) a friend claims that flipping a coin 100 times and finding that it comes up heads only 45% of the time shows that the coin is biased. how should you reply?
with 100 flips, the outcome is very likely to be 45 heads or even less.
just because you have a 50% chance of getting heads, does not necessarily mean that you will get heads at exactly 50%.
100 coin flips will not always produce a 50-50 outcome of heads or tails. This is due to the fact that random events, while predictable in the long run, are not 100% predictable in small cases. For example, if we flipped a fair coin a quadrillion times, the variability in the outcomes caused by the coin's randomness would amount to a fractional value so small that calculators might even round the percentage of heads to 50%. However, with 100 flips, the outcome is very likely to be 45 heads or even less.
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4. The first three terms of an infinite geometric sequence are m – 1,6, m + 8.
(a)write down two expressions for r.
(b) the find two possible values of m.
(c) Hence, find two possible values of (r)
In the given geometric sequence
a) The expression of the common ratio r = -6 and (m+8)/2
b) The possible value of m = -28
c) The possible value of r = -6
The geometric sequence is
-1 , 6, m+8
The the common ratio = second term / first term
= 6 / -1
= -6
The common ratio = third term / second term
= (m+8)/6
The two expressions of common ratio is -6 and (m+8)/6
Part b
The third term = second term × common ratio
= 6 × -6
= -36
Then,
m +8 = -36
m = -36 + 8
m = -28
The possible value of m = -28
Part c
The possible value of r = -6
Hence, in the given geometric sequence
a) The expression of the common ratio r = -6 and (m+8)/2
b) The possible value of m = -28
c) The possible value of r = -6
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