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10 questions from this quiz
a=(1−p)a = (1-p)a=(1−p) and b=pb = pb=p
Because (1−p)+p=1(1-p) + p = 1(1−p)+p=1, so 1n=11^n = 11n=1
E(X)=npE(X) = npE(X)=np
When x=0x = 0x=0, the term equals zero
z=x−1z = x - 1z=x−1
Var(X)=np(1−p)\text{Var}(X) = np(1-p)Var(X)=np(1−p)
x2x^2x2 is not a factor of x!x!x!
n(n−1)p2n(n-1)p^2n(n−1)p2
When p=0.5p = 0.5p=0.5
E[X(X−1)]=E(X2)−E(X)E[X(X-1)] = E(X^2) - E(X)E[X(X−1)]=E(X2)−E(X)
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