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18 March, 11:43

A coin is tossed 11 times. what is the probability of obtaining exactly 9 heads?

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  1. 18 March, 12:48
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    Binomial distribution ...

    n=11

    p (head) = 0.5

    11C9x 0.5^9 x 0.5^2

    there you go.
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