Question

You are about to take a test consisting of 20 True-False questions (a test for which you haven’t studied a lick). Your plan is merely to guess randomly on each answer.
a. A passing grade on the test is 60%. Given your “pure guess” strategy, how likely is it that you will pass the test?
b. To make no worse than a B grade on the test, you would need at least an 80% score. What are your chances?
c. Suppose you walk into the exam and discover that the format is not True-False as you had expected, but rather multiple choice, with four choices for each question. Under your “pure guess” strategy, how likely is it that you pass this exam?


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  • CreatedJuly 16, 2015
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