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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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andrey2020 [161]

Answer:

(m-5) (n-4)

Step-by-step explanation:

mn - 4m - 5n + 20

We will factor by grouping

mn -5n  -4m +20

Factor an n out of the first 2 terms and a -4 out of the last 2 terms

n (m-5) -4(m-5)

Now factor out a m-5

(m-5) (n-4)

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3 years ago
How do I solve 3 1/2r = 28
lozanna [386]
3 1/2r=28
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3 years ago
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Stella [2.4K]
If you can label your graph then I could a lot more, but
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Domain [0,infinity)
Range [0, infinity)
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3 years ago
Please answer fast!!!!!
BlackZzzverrR [31]

Answer:

x = 2

Step-by-step explanation:

note that 4096 = 8^{4} , then

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3 years ago
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If the points (–2, –1), (–1, 0), (2, 3), and (–3, –2) are joined to form a straight line, at what point does the line intersect
Snowcat [4.5K]

Answer:

0

Step-by-step explanation:

Pick 2 points and use the slope formula

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Slope =(y2−y1)/(x2−x1)

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Hope this helps! Plz award Brainliest : )

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