On a multiple choice test with 11 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the mean for the number of correct answers.
A) 5.5
B) 2.8
C) 3.7
D) 8.3

Question

Quizplus · Accepted Answer

The mean number of correct answers can be found by multiplying the probability of getting a question right (1/4) by the total number of questions (11). Thus, the mean is 11 * (1/4) = 2.75, which rounds to 2.8.

On a Multiple Choice Test with 11 Questions, Each Question