Author Nicoliex3 in Mathematics, 08.22.2019

A fair coin is tossed 100 times. What is the probability that more than 55 heads are observed?

Answered by Everest2017

Let us say T= probability of head turning up = 1/2  in one tossH = probability of a tail turning up  = 1/2  in one tossThen P (56 heads or more) =            1/2^100 [ C(100,56) + C(100,57) + C(100,58) + ....                         C(100,98) + C(100,99) + C(100,100) ]   where C(N, R)  =  N ! / [ (N - R)! R! ]    number of occurrances of R formed from                              N tosses.

Answered by konrad509

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