Solve the problem.
-On a multiple choice test with 29 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the number of correct answers.
A) 5.4
B) 54.4
C) 2.3
D) 29.6

Question

Quizplus · Accepted Answer

The standard deviation for the number of correct answers for guessing on a multiple choice test can be found using the formula sqrt(npq), where n is the number of questions, p is the probability of getting a correct answer (1/4 in this case) and q is the probability of getting an incorrect answer (3/4 in this case). Therefore, the standard deviation in this case is sqrt(29*(1/4)*(3/4)) = 2.3. Therefore, the correct answer is C.

Solve the Problem. -On a Multiple Choice Test with 29 Questions, Each Question