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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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Andru [333]

Answer:

The annual increase in the percentage of a pollution can be determined by some mathematical calculation.

Step-by-step explanation:

  • In order to determine the annual percentage increase over one year for a city population, we must do the following,
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  • Now divide the whole by the starting value.
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This finally gives you the rate of increase in the population in percentage.

5 0
4 years ago
Find fifth roots of z⁵ + 32 = 0 and draw its graph?
Lera25 [3.4K]

Answer:

Step-by-step explanation:

4 0
4 years ago
I need help with 3,4,5<br> Please!!
gladu [14]
3. g(x) = x^2 - 5x + 3
    g(-3) = -3^2 - 5(-3) + 3
    g(-3) = 9 + 15 + 3
    g(-3) = 27 <==

4. 4(7b + 15f - 8f) =
    4(7b + 7f) =
     28b + 28f <===

5. C = 2.50r + 15
    for 5 rolls...r = 5
    C = 2.50(5) + 15
    C = 12.50 + 15
    C = 27.50...its A
3 0
3 years ago
An Uber fare is calculated using the formula: Base Fare + (Cost per minute x time of the ride in hours).
pantera1 [17]

Answer:

$40

Step-by-step explanation:

substitute numbers:

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3 0
2 years ago
Help me pls? it will mean a lot
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3 years ago
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