Solution :
Given that n = 12 , p = 0.8
=> q = 1 - p = 0.2
=> Formula for binomial distribution , P(x = r) = nCr*p^r*q^(n - r)
=> nCr = n!/(r!*(n-r)!)
=> P(x >= 11) = P(x = 11) + P(x = 12)
= 12C11*0.8^11*0.2^1 + 12C12*0.8^12*0.2^0
= 0.2062 + 0.0687
= 0.2749
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