On a multiple choice test with 17 questions, each question has four possible answer, one of which is correct. For students who guess at all answers, find the mean for the number of correct answers.
a. 12.8
b. 8.5
c. 4.3
d. 5.7

C. 4.3

Step-by-step explanation:

Given that

n = 17

P = 1/4

Using binomial

Mean = np

Mean = 17 × (1/4)

= 17 × .25

= 4.25

Approximately = 4.3

20

step-by-step explanation:

4th option is correct xy=-10

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