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31 December, 15:07

An exam consists of 15 true-or-false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly 9 questions correctly? (Round your answer to three decimal places.).

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  1. 31 December, 15:30
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    C (15,9) * (1/2) ^9 * (1/2) ^6 = 5005/32768 =.153 approx
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