math problem help asap?

fatthief

find the probability using biomial distribution

n=64,x=3,p=.04

dale-williams_6095e20d565aa

P(x|n) = nCx * p^(x) * (1-p)^(n-x)

where C is the combination operator.

P(x=3|n=64) = ( 64!/[(64-3)!3!]} * (0.04)^3 * (.96)^61

= 0.221 <= answer

blue-berry

I have no clue!!!