Question 912886
p(smart pome) = .56,  n = 20
P(x < 5) = binomcdf(20, .56, 4)= P(0) + P(1) + P(2) + P(3) + P(4) 
Where
{{{P(x)= highlight_green(nCx)(p^x)(q)^(n-x) }}} 
p and q are the probabilities of success and failure respectively. 
In this case p = .56 and q = .44, n = 20
{{{nCx = (n!)/x!(n - x)!)}}}