A multiple choice exam offers four choices for each question. Paul just guesses the answers, so he has probability 1/4 of getting any one answer right.
What is the expected number of right answers Paul will get if the test has 20 questions?
A) 5
B) 4
C) 2
D) 1/4
E) Can't tell from the information given.

Question

Quizplus · Accepted Answer

The expected number of right answers is calculated by multiplying the probability of getting an answer right (1/4) by the total number of questions (20). This gives 20 * (1/4) = 5.

A Multiple Choice Exam Offers Four Choices for Each Question