B(n,k):=binomial(n,k)*p^k*(1-p)^(n-k);

B(24,18);

p:0.92;

B(24,18);

kill(p);

p:0.76;

sum(B(20,k),k,15,20);

esperance:8*0.93;

var:esperance*(1-0.93);

sqrt(var);