Several students are unprepared for a true/false test with 25 questions, and all of their answers are

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Several students are unprepared for a true/false test with 25 questions, and all of their answers are guesses. Find the mean, variance, and standard deviation for the number of correct answers that would be expected for such students. Would it be unusual for one of these students to get a good mark by guessing at least 20 correct answers? Why or why not?
Find the indicated values.
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Elementary Statistics

ISBN: 9780321225979

3rd Canadian Edition

Authors: Mario F. Triola

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