Question

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

Answer 1

C. 4.3

Explanation:

Given that

n = 17

P = 1/4

Using binomial

Mean = np

Mean = 17 × (1/4)

= 17 × .25

= 4.25

Approximately = 4.3