let X be a geometric random variable, and assume that Var(X) = 5

a) what is the conditional variance Var(X-4 | X>4)?

b) what is the conditional variance Var(X-8 | X>4)?

1 answer

a) V(x-4|x>4)=V(x-4)

=V(x)

=5

b)V(x-8|x>4)=V(x-8)

=V(x)

=5