Question 1168330
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