Ms. Davis is doing an activity with her statistics students where she gives them a 202020-question multiple choice test, and they know none of the answers. Students need to guess on every question, and each question has 555 possible choices, 111 of which is correct.
What are the mean and standard deviation of the number of questions that each student gets correct?
You may round your answers to the nearest tenth.
Answers
Answer:
The mean and standard deviation of the number of questions that each student gets correct are 4 and 1.789 respectively (
Answer: mean: 4
standard deviation: 1.79
Step-by-step explanation:
Related Questions
Two buses leave towns 304 miles apart at the same time and travel toward each other. One bus travels 14 mih slower than the other. If they meet in 2 hours, what is the rate of each bus?
Answers
Answer:
The faster bus moves at 83mi/h and the slower one moves at 69mi/h.
Step-by-step explanation:
Let's define:
R₁ = rate of bus 1, this is the faster one.
R₂ = rate of bus 2, this is the slower one.
We know that one bus travels 14mi/h slower, then:
R₂ = R₁ - 14mi/h.
Now we know that:
Distance = Speed*Time.
If we add the distances that both busses travel in 2 hours, it should be equal to the initial distance between the buses, then:
R₁*2h + R₂*2h = 304 mi
Then we have the two equations:
R₂ = R₁ - 14mi/h
R₁*2h + R₂*2h = 304 mi
The first step is to replace the first equation in the second one, to get:
R₁*2h + (R₁ - 14mi/h)*2h = 304 mi
And now we can solve this for R₁.
R₁*2h + R₁*2h - 14mi/h*2h = 304 mi
R₁*4h - 28mi = 304mi
R₁*4h = 304mi + 28mi = 332mi
R₁ = 332mi/4h = 83mi/h
The faster bus moves at 83mi/h
And we know that the slower one moves at 14mi/h slower than this, then:
R₂ = R₁ - 14mi/h = 83mi/h - 14mi/h = 69 mi/h
It was John's birthday, 1/2 of his cupcakes were choco lava, the other half was strawberry. There were 10 strawberry cupcakes. Rick ate 2/4 of choco lava cupcakes. Steward ate 1/10 of the strawberry How much did Rick and Steward eat?
Answers
Rick ate 5 Chocolate Cupcakes
Steward are 1 Strawberry Cupcake
Answer:
6 cupcakes or 6/10 or 3/5
Step-by-step explanation:
Harper knows he is 50 yards from school. The map on his phone shows that the school is 34 inch from his current location.
How far is Harper from home, if the map shows the distance as 3 inches?
Answers
so 1 inch = 1.47058824 yards
3 inches = 4.41176471
you can round this number up to 4.41 yards depending on what the paper says
Over the holiday break, Ms. Horton baked a ham that was 19 1/4 pounds.
By the end of the night there was 6 7/10 pounds left. How much turkey was
eaten that night?
Answers
Answer:
12 11/20
Step-by-step explanation:
the answer to the question is 12 11/20
Write an equivalent expression for each the following:
a. x + x + x+ 2x + x =
b. (x + 2) (x + 2) =
c. y + y + y + y + 10 + y + 1 =
Answers
In which of the following expressions is 5 a coefficient?
5y + 42
19x + 4y + 5
O x² + 4x2
Ox+3+2x X
Answers
Answer:
The first one
Step-by-step explanation:
I hope this helps with your answer :)
Answer:
The first one, 5y +42
Step-by-step explanation:
A coefficient is a variable with a number multiplied to it. Ex. 3y
Only in the first one is 5 a coefficient.
The sum of two numbers is 52. The difference of the two numbers is 6. Find the two numbers.
b) Write the equations.
Answers
Answer:46
Step-by-step explanation:
Which is rational and irroational
Answers
Answer:
1. Rational
2. Irrational
3. Irrational
4. Irrational
5. Rational
Step-by-step explanation:
I am not 100% this is correct, but I tried my best
Hope this helps!
~PurpleMist
Hank's Bicycle Rentals charges an initial fee of $15 and an hourly rate
of $4.50 to rent a bicycle. Maria's Bicycle Rentals charges an initial fee of
$12 and an hourly rate of $5.00. For how many hours of renting a bicycle
would the two rental companies charge the same amount?
Answers
Answer:
6
Step-by-step explanation:
At 6 hours they both charge $42
The length of a freeway is 600 miles. If 0.5 inch represents 50 miles, what is the length of the freeway on the map?
Answers
12/2= 6 inches
A plot of land is an irregular triangle with a base of 112 feet and a height of 47 feet. What is the area of the plot?
Answers
Any triangle’s area is
1/2xbasexheight
The question gives you both so just multiply em
1/2x 112x 47 = 2632 square feet
The area of irregular triangle is 2632 sq. ft.
What is Triangle?A triangle is a closed shape with 3 angles, 3 sides, and 3 vertices. A triangle with three vertices P, Q, and R is represented as △PQR.
Here, given dimension of irregular triangle;
base = 112 feet.
height = 47 feet.
we know that,
Area of triangle = 1/2 X Base X Height
= 1/2 X 112 X 47
= 56 X 47
= 2632 ft²
Thus, the area of irregular triangle is 2632 sq. ft.
Learn more about Triangle from:
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An artist can create 4 pieces of pottery in 2 hours. What’s the artist’s unit rate?
Answers
Are the two figures similar? If so, give the similarity ratio of the smaller figure to the larger figure.
Answers
Answer:
yes 1:2
Step-by-step explanation:
Set up the ratio
Cylinder(1) = 6.4:3.2
Cylinder(2) = 4:2
Is 6.4/3.2 = 4/2?
12.8 = 12.8!
So yes.
Asphere has a radius of 27 inches. A horizontal plane passes through the center of the sphere.
Part 1 out od 2
Describe the cross section formed by the plane and the sphere.
Answers
9514 1404 393
Answer:
circle of radius 27 inches
Step-by-step explanation:
Anywhere a plane cuts a sphere, the cross section is a circle. When the plane includes the center of the sphere, the circle has the same radius the sphere has.
The cross section is a circle of radius 27 inches.
PLEASE HELP IT IS DUE TODAY!!Alicia drew a map of Texas. in the scale Alicia used for the map 1/2 inch represents 20 miles. What is the distance between two cities on the map of the actual between the two cities is 360 miles please help me :( Thank you
Answers
Answer:
9in on the map
Step-by-step explanation:
1/2in=20m or 1in=40m
360/40=9
9in
How many yards are equivalent to 18 inches?
Answers
Answer:
0.5 yards
Step-by-step explanation:
Explanation: because I said so *dabs*
A card is chosen at random from a standard deck of cards. What is the probability that the card chosen is a heart or spade? Are these events mutually exclusive?
Answers
Answer:
a. Probability is 50%
b. Picking either a heart or spade is mutually exclusive
Step-by-step explanation:
There are 52 cards in a deck of cards.
Of those 52, 13 are hearts and 13 are spades.
The probability of picking wither of them is therefore:
= (13 + 13) / 52
= 26/52
= 50%
Mutually exclusive events are those that cannot occur at the same time. You can either pick a heart or you can pick a spade. You cannot pick both at the same time so these are mutually exclusive.
Which statement about the graph of y= 3x+5 is correct?
a. The line passes through the ordered pair (3, 0) and has a slope of 5.
b. The line passes through the ordered pair (0,5) and has a slope of 3.
c. The line passes through the ordered pair (5,20) and has a slope of 5/3
d. The line passes through the ordered pair (3, 14) and has a slope of 3/5
Answers
Answer:
b. The line passes through the ordered pair (0,5) and has a slope of 3.
Step-by-step explanation:
The equation given is in slope-intercept form.
[tex]y= mx+b[/tex]
m = slope
b = y-intercept
The slope is 3 in the equation. 3 is in m's spot.
[tex]y=\boxed{m}x+b\\\\y=\boxed{3}x+b[/tex]
The y-intercept is 5. This means that the line will pass through (0,5).
[tex]y=mx+\boxed{b}\\\\y=3x+\boxed{5}[/tex]
The correct option should be B.
Hope this helps.
Miya is selling grapefruit and nuts for a fundraiser. The grapefruits cost 5 dollars each and a bag of nuts cost 15 dollars each. She sells 30 items and made 250 dollars. How many grapefruits did she sell?
Answers
Answer:
A) 5G + 15N = 250
B) G + N = 30 We'll multiply B) by -5
B) -5G -5N = -150 then we add A)
A) 5G + 15N = 250
10N = 100
N = 10 bags of nuts ($150.00)
We put N=10 into A)
A) 5G + 150 = 250
A) 5G = 100
G = 20 Grapefruits ($100.00)
Step-by-step explanation:
34) Which equation is equivalent to: 3r=78+14 ?
A. −3r=−78+14
B. 3r−14=78
C. 3r=78−14
D. −3r=78−14
Answers
The function P(d) = 1 + + gives the pressure, in atmospheres (atm), at a depth d feet in
the sea. Find and interpret P(59). Do not round your answer.
59
331
At a depth of 33 feet, the pressure is 59 atm.
b) 22; At a depth of feet, the pressure is 59 atm.
c) 39; At a depth of 59 feet, the pressure is atm.
d) 33; At a depth of 59 feet, the pressure is 3 atm.
Answers
Answer:
c) 39; At a depth of 59 feet, the pressure is atm.
write the fraction 4/12 as a division expression
Answers
Answer:
4 ÷ 12 = 0.33333333333
Step-by-step explanation:
jason went to the store to buy a trampoline with his dad the trampoline was 60% off and they paid $90 how much did it cost without the discount
Answers
Answer:
It costed $150 dollars
Step-by-step explanation:
You divide 90 by 60 to get 1.5 then you multiply that by 100 to get 150
Sarah drives her car for 2 1/2 hours with a constant speed of 60 mph. What is the distance Sarah traveled?
Answers
Answer:
Bro I gave you the answer fully explained and then some noob deleted it so Im sorry your answer is 150 miles because 60 minutes in one hour and she drove 2.5 hours which is 150 miles. Hope this helps
Step-by-step explanation:
a machine fills boxes at a constant rate at the end of 35 minutes it has filled 5 boxes which table represents the relationship between the number of minutes the minutes fills boxes and the number of boxes it has filled.
Answers
Answer:
well you see the times go up by whatever the first number is so solve it that way
Step-by-step explanation:
Which of the following fractions compares BC to BD?
2/3
5/2
2/5
3/2
Answers
Answer:
2/3
Step-by-step explanation:
brainliest
The fraction that compares BC to BD is 2/3.
What is a fraction?An element of a whole is a fraction. The number is represented mathematically as a quotient, where the numerator and denominator are split. Both are integers in a simple fraction. A fraction appears in the numerator or denominator of a complex fraction. The numerator of a proper fraction is less than the denominator.
The distance between B and C is 2-0 = 2 units horizontally and 1-1 = 0 units vertically, so BC is a horizontal segment of length 2 units.
The distance between B and D is 3-0 = 3 units horizontally and 1-1 = 0 units vertically, so BD is also a horizontal segment of length 3 units.
Therefore, BC/BD = 2/3.
So the fraction that compares BC to BD is 2/3.
To learn more about fractions;
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What is the constant term in the expression?
15a + 10b + 5 – 7b
Answers
Answer:
5
Step-by-step explanation:
15a , 10b , and -7b are coefficients.
there is more i need to take more pictures of it
Answers
the x-intercepts of the graph of y=2x^2-16x+30 are (3,0),(5,0) ? what is the x-coordinate of the vertex?
Answers
Answer:
x=-4
Step-by-step explanation:
vertex formula is -b/2a
-(16)/2(2)
x=4
H+4.78=8.02 evaluate
Answers
Answer:
h=3.24
Step-by-step explanation: