quiz consists of 20 multiple choice questions, each with five possible answers, only one of which is correct. If a student guesses on each question, what is the mean and standard deviation of the number of correct answers?
mean: 4; standard deviation: 1.78885438
mean: 10; standard deviation: 1.78885438
mean: 4; standard deviation: 2
mean: 10; standard deviation: 3.16227766

Answers

Answer 1

Answer:

I think mean 10; 3.16

Step-by-step explanation:


Related Questions

if you take 4 steps every 6 minutes, how long will 10 steps be?​

Answers

Answer:

15

Step-by-step explanation:

divide 6 into 4 than what ever your answer is multi... by 10

Amanda can jog 18 miles in 5 hours.

Answers

Answer:

the probelm does not make sense

Step-by-step explanation:

you can try dividing

Answer:

14.4 miles

Step-by-step explanation:

Amanda can jog 18 miles in 5 hours.

At the same rate how many miles can Amanda jog in 4 hours=??

solution:

Distance covered by Amanda in 5 hours = 18 miles

Distance covered in  1 hour = 18/5 miles

Distance covered in  1 hour is =3.6

Distance covered in 4 hours = 4*3.6=14.4

Hence Amanda can jog 14.4 miles in 4 hours

Which table shows a linear function?
-4
- 1
1
2
3
у
8
2
2
4
6
-16
-8
х
-6
-2
0
1
3
-2.
2
y
0
-2

Answers

It’s 12 units long I
Hope it the answer just trying to help

AB = [ 4 ]. Find A if B=(22]​

Answers

Answer:

A = 2/11

Step-by-step explanation:

22A= 4

(22A)/22 = 4/22

A = 4/22 = 2/11

help me please asap

Answers

C is the answer to you question

1.What should be the c-value in the equation shown below if the equation is a perfect square trinomial

Answers

Answer:

64

Step-by-step explanation:

a² + 2ab + b²

→ Identify the value of a

a = 1

→ Find b using a

-16 ÷ ( 2 × 1 ) = -8

→ Square the b term

( - 8 )² = 64

Select the correct graph.

Which graph represents function f?

Answers

Answer: top right graph

Step-by-step explanation: Put in calculator and you will find the answer

Help please and no links

Answers

Answer:

D

Step-by-step explanation:

right 6 units , B is 3,6 which is right 6 units from point f

Answer:

you

point

stealer.com

Step-by-step explanation:

what does a value of 8 in 589310 compare yo the value of the 8 ine 598301​

Answers

Answer:

10

Step-by-step explanation:

It is 10 times as much

A flag is 100 inches tall and 149 inches long.
What is its perimeter in inches?

Answers

Answer:

498

Step-by-step explanation:

100+100+149+149=498

Triangle ABC maps to triangle A′B′C′ by a 90∘ rotation counterclockwise about the origin.

If AB=61 units, BC=11 units, and AC=60 units, what is the length of A′C′?
11 units
61 units
90 units
60 units

Answers

Answer:

60 Units

Step-by-step explanation:

The length of AC does not change. Since the translation is a rotation, nothing about the size of the triangle should change. Meaning A'B'C' is still 60 units in length.

The length of the side A'C' of the triangle after rotation is A'C' =AC = 60 units

What is Rotation?

The measure of the amount a figure is rotated about the center of rotation is called the angle of rotation. The angle of rotation is usually measured in degrees. We specify the degree measure and direction of a rotation.

90° clockwise rotation: (x,y) becomes (y,-x)

90° counterclockwise rotation: (x,y) becomes (-y,x)

180° clockwise and counterclockwise rotation: (x, y) becomes (-x,-y)

270° clockwise rotation: (x,y) becomes (-y,x)

270° counterclockwise rotation: (x,y) becomes (y,-x)

Given data ,

Let the triangle be represented as ΔABC

Now , the measures of the sides of the triangle are

The measure of side AB = 61 units

The measure of side BC = 11 units

The measure of side AC = 60 units

And , the triangle is rotated by 90° counterclockwise  about the origin

The coordinates of the triangle after rotation is A'B'C'

And ,

The measure of side A'B' = 61 units

The measure of side B'C' = 11 units

The measure of side A'C' = 60 units

The length of the sides of the triangle does not change during a transformation of rotation by any degree

Hence , the measure of side A'C' of triangle is 60 units

To learn more about rotation click :

https://brainly.com/question/3956347

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HELP ME FAST PLEASE!!!!!
the volume of a triangular prism is 32 cubic inches. The prism is 2 inches tall. What is the area of the base of the triangular prism?
A. 4 square inches
B. 12 square inches
C. 8 square inches
D. 16 square inches

Answers

Answer:

D. 16 in²

Steps:

given:

V = 32 in³

h = 2

Ab = V/h

Ab = 32/2

Ab = 16 in²

Angle P and angle Q are supplementary angles. If m(angle)p is 21 degrees less than twice the measure of
Angle Q , find the measure of each angle.

Answers

Answer:

Angle Q: 67 degrees

Angle P: 113 degrees

Step-by-step explanation:

You can write an equation to solve this. We know that angle P + angle Q = 180. If we substitute angle Q into the second equation we get angle P = 2*angle Q -21.

Plugging that knowledge into the first equation, we get 2*angle Q-21 + angle Q =180. Simplifying, we get 3* angle Q -21 = 180. Adding 21 to both sides gives us 3*angle Q = 201, dividing by 3 gives us angle Q = 67. 180-67= 113 so angle P is 113.

Help me please I need help with this math homework

Answers

What is the question?

Does anyone know the answer to this one ???


What number divided by −3 gives 12 as the result

Answers

Answer: -36

Step-by-step explanation: a negative and a negative give a positive so -36/-3=12

(to check your answer you can also always just multiply the two numbers ex: 12 x -3= -36)

Find the surface area of the pyramid.

Answers

You would Mylutilpy 14x16

Plz someone help me on these 2 questions!! I'm desperate :)

Answers

Answer:

Step-by-step explanation:

7. The graph does not touch the x axis and never will

8. Horizontal asymptote is y=-100

giving brainliest!! *easy*

Answers

Answer:

615.44

Step-by-step explanation:

There are 6 squares and 9 circles. What is the simplest ratio of squares to
total shapes?

Answers

Answer:

2:5

Step-by-step explanation:

According to one study, the average monthly cell phone bill in the U.S. is $70. If a 20-year old student with an average bill gives up her cell phone and each month invests the $70 she would have spent on her phone bill in a savings plan that averages a 4% annual return, how much will she have saved by the time she is 65?

Answers

Answer:

$37,800

Step-by-step explanation:

If she put 70 dollars in every month for 45 years she would have $37,800

The angle \theta_1θ
1

theta, start subscript, 1, end subscript is located in Quadrant \text{II}IIstart text, I, I, end text, and \sin(\theta_1)=\dfrac{9}{41}sin(θ
1

)=
41
9

sine, left parenthesis, theta, start subscript, 1, end subscript, right parenthesis, equals, start fraction, 9, divided by, 41, end fraction .
What is the value of \cos(\theta_1)cos(θ
1

)cosine, left parenthesis, theta, start subscript, 1, end subscript, right parenthesis?

Answers

Trig identity are written in term of cosine, sine and tangent, he value of cosθ if the value of sinθ is 9/41 is 40/41

Trigonometry ratio

Given the following parameters

sinθ = 9/41

According to the SOH CAH TOA identity

sinθ = opposite/hypotenuse

Determine the adjacent sides

a= √41² - 9²

a = √ 1600

a = 40

Determine the value of cosθ

cosθ = adjacent/hypotenuse

cosθ = 40/41

Hence the value of cosθ if the value of sinθ is 9/41 is 40/41

Learn more on trigonometry identity here:https://brainly.com/question/7331447

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Answer:

-40/41

Step-by-step explanation:

5% of a number is 27.
1 %of the same number is 5.4
work out 14% of the number.

Answers

Answer:

75.6

Step-by-step explanation:

100*5.4=540

540/14=75.6

0) 9 deliveries in 3 hours deliveries in 1 hour Submit​

Answers

Answer: 3 delivers an hour

Step-by-step explanation:

9/3=3

Sean Wrona is the fastest typist in the world and can type an average of about 500 words in three minutes.
What is Sean’s average typing speed in words per minute, WPM, to the nearest whole number?

Answers

Answer:

166.67 is answer of this question

Please help me im gonna fail.

Answers

Answer:

see below

Step-by-step explanation:

if the radius is 21, then the height is 24  (21 is 3 less than 24)

[tex]v=\pi r^{2} h\\v=\pi 21^{2} (24)\\v=\pi 441*24\\V=\pi 10.584\\v=3.14(10.584)\\V=33234[/tex]

the closest option would be the 33264

Evaluate the expression for r = 2.

17 + r =

Answers

17+r= 19 because you replace r with 2 since r equals too and you get 19

standard normal distribution​

Answers

Answer:

distribution form is like    12x6+24

Step-by-step explanation:

 standard form  is like 128                                                                                                                        

he point A has coordinates A(2, 4). What are the X-coordinates of A′ for the dilation D1.5(A)?

Answers

Answer:

(3,6)

Step-by-step explanation:

For dilation, you just multiply the coordinates by the scale factor (in this case 1.5) to get the answer! Hope that helps :)

Timothy took 2/3 hr to paint a portrait. This was 1/3 hr shorter than the time he took to paint scenery. How long did he take to paint scenery? I need help ASAP

Answers

Answer:

1 hour

Step-by-step explanation:

2/3+1/3

=3/3 or 1

that's my answer

i hope it helos

Pls Help and put a proper answer!
You want to buy a digital camera that costs $234. You have saved $50 so far. You earn $6.50 per hour at your summer job. Write and solve an inequality that represents the number of WHOLE hours you need to work in order to buy the digital camera.

Answers

6.5x+50>_234
C=#of hrs (>_ is the greater than equal to symbol btw)

6.5x+50>_234
-50. -50
6.5x/6.5>_184/6.5

x>_ 24 hrs


Answer:

H = (234 - 50)/6.50

H = 29 hours

Step-by-step explanation:

H = hours to work

H = (234 - 50)/6.50

H = 28.31 hours

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Conducting research for any nonfiction text about sub-Saharan Africa will likely bring you to an overwhelming number of results, so it will be helpful to choose a key topic and go from there.Here are a few questions you can ask yourself to focus your search:Is there a particular geographical area of Africa that is most interesting to me?Are there any recent current events that I am interested in learning more about?What do I already know about Africa? Do I want to know more about one of those topics?Am I most interested in a book that focuses on an economic, social, or political topic?Economic topics related to sub-Saharan Africa include economic struggles in African countries, the impact of the slave trade on the African economy, the overuse of natural resources in parts of Africa, etc.Social topics related to sub-Saharan Africa include the HIV/AIDS epidemic, a concept called "brain drain," and religious and cultural conflict.Political topics related to Sub-Saharan Africa include political unrest, the impact of colonialism on government, and etc.Write an explanatory essay that summarizes the key points of the text you selected for the book study and discusses your evaluation of its strengths and weaknesses. You should use the APA Style to format your in-text citations and works-cited page. Click here to review the Style Guide.Your essay should be no less than 250 words in length. 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