Question 1168330: A fair coin is flipped 12 times. Find the probability that more than 8 of the flips turn up tails.
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! This is the probability of 9,10,11,12 are tails.
nine would be 12C9(1/4096), since it is 1/2 heads and 1/2 tails and the product will be (1/2)^12
plus 12C10+12C11+1
=220+66+12+1*1/4096
=(299/4096)=0.0730
or 1-binomcdf(12,8,0.5)=0.0730
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