A student takes an exam containing 20 true or false questions. if the student guesses, what is the probability that he will get exactly 5 questions right ? Round your answer to four decimal places.

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Author:Amos Gilat
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A student takes an exam containing 20 true or false questions. if the student guesses, what is the probability that he will get exactly 5 questions right ? Round your answer to four decimal places.
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A student takes an exam containing 1212 true or false questions. If the student guesses, what is the probability that he will get between 33 and 77 (both inclusive) questions right? Round your answer to four decimal places.

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