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svp [43]
3 years ago
6

Ms. Davis is doing an activity with her statistics students where she gives them a 20-question multiple choice test, and they kn

ow none of the answers. Students need to guess on every question, and each question has 5 possible choices, 1 of which is correct. What are the mean and standard deviation of the number of questions that each student gets correct?
Mathematics
1 answer:
Anvisha [2.4K]3 years ago
4 0

Answer:

Average: 4

Standard Deviation: 0

Step-by-step explanation:

Because we don't know how each student did we are going to assume that they all got 20% of the questions right

20% of 20 is 4

Which means that we can assume each student got 4 questions correct

Because all entries are the same the standard deviation is 0

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Dan and Dave can work together to paint a house in 4 days. Dan works twice as fast as Dave. How long would it take each of them
SSSSS [86.1K]

Answer:

Dan=6 days Dave=12 days

Step-by-step explanation:

1/2x + 1/x = 1/4

multiply each by 8x bc 4 * 2x = 8x

4 + 8 = 2x

12 = 2x

6 = x

8 0
3 years ago
Compare and contrast a rhombus to a square. Make sure to address items such as sides and angles HELP PLZ!!!
Sauron [17]
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3 years ago
Read 2 more answers
1. On Tuesday, Elena completed 20 items of her math homework in 36 minutes. At that same rate, how long will it take her to comp
zepelin [54]
The correct answer is 63 minutes, what you do is divide 36/20 to get 1.8 then multiply 35*1.8 to get 63.
Brainliest answer?
4 0
3 years ago
Does the table represent y as a function of x? Justify your answer.​
Otrada [13]

Answer:

  • No

Step-by-step explanation:

As per definition of the function, every x- value (input) has exactly one corresponding y-value (output)

<u>We can see on the table:</u>

  • x = 3.45 and y= 1.72
  • x = 3.45 and y = 3.36

Two same input values with different outputs.

So this not a function

6 0
3 years ago
Mason's annual income is $42,500. He receives an increase of 3.5% every year
Marysya12 [62]

The function that models Mason's yearly income is 42,500(1  + 0.035)^x.

Mason's income after 5 years would be $48,084.85.

<h3>What would be Mason's income after 5 years?</h3>

The function that models Mason's income is an exponential function that has the form:

p(1 + r)^x

Where:

  • r = percentage increase
  • x = number of years
  • p = present income

42,500(1  + 0.035)^x

Income after 5 years: 42,500(1  + 0.025)^5 = $48,084.85

To learn more about exponential functions, please check: brainly.com/question/26331578

#SPJ1

7 0
2 years ago
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