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OpenStudy (anonymous):
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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OpenStudy (amistre64):
whats your thought process on this?
OpenStudy (amistre64):
\[\binom{n}{k}p^{k}~q^{n-k}\]
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