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9 September, 04:04

A fair coin is tossed 5 times. what is the probability that it lands tails up exactly 3 times?

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  1. 9 September, 04:38
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    P (tail) = 1/2 p (head) = 1/2

    5C3 (1/2) ^3 x (1/2) ^2 = 0.313
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