Question: A multiple-choice test has 20 questions and 5 choices for each question. If a student is totally unprepared and guesses on each question, the mean

A multiple-choice test has 20 questions and 5 choices for each question. If a student is totally unprepared and guesses on each question, the mean is the number of questions she can expect to answer correctly.
(a) How many questions can she expect to answer correctly?
(b) What is the standard deviation of the distribution?

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