On a multiple choice test with 17 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) 4.3 questions
B) 12.8 questions
C) 5.7 questions
D) 8.5 questions

Question

Quizplus · Accepted Answer

The mean number of correct answers when guessing is calculated by multiplying the probability of getting a question right (1/4) by the total number of questions (17). So, 17 * (1/4) = 4.25, which is approximately 4.3 questions.

On a Multiple Choice Test with 17 Questions, Each Question