THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A multiple choice quiz has five questions,each with five answers,A through E.Assume you just guess on all of the questions.
-What is the probability that you get exactly three questions right?
A)0.00032
B)0.0016
C)0.008
D)0.04

Question

Quizplus · Accepted Answer

The probability of guessing one question correct is 1/5. The probability of guessing one question incorrect is 4/5. Therefore, the probability of getting exactly three questions correct and two incorrect is (1/5)^3*(4/5)^2*C(5,3) = 0.008.