Question 1106567
Binomial probability formula is 
:
Probability (P) ( k successes in n trials) = nCk * p^k * (1-p)^(n-k), where nCk is n! / (k! * (n-k)!)
:
for this problem n=1515, x=11, p=0.65, Note that x is k in the above formual
:
P ( 11 successes in 1515 trials) = 1515C11 * (0.65)^11 * (1-0.65)^(1515-11) < 0.000001
: