Question 871129
p(boy) = .5,  n = 5
P(x ≥ 3) = 1 - binomcdf(5, .5, 2) = .5
0r
Using {{{P (x)= highlight_green(nCx)(p^x)(q)^(n-x) }}} 
P(x ≥ 3) = P(x=3)+P(x=4)+P(x=5) = .3125 + .15625 + .03125