Suppose X is binomially distributed with parameters n & p. furthermore, suppose that E(X) = 5 & Var(X) = 4, find n & p?
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Mean E(X)=np=5
Var(X)=npq=4
npq/np=4/5
q=4/5
p=1/5
n(1/5)=5
n=25
Var(X)=npq=4
npq/np=4/5
q=4/5
p=1/5
n(1/5)=5
n=25
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