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Let A and B be two events. If P(A | B) = P(A), then A is ___________ of B.

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If A and B are two events such that

and , then p = _____

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If A and B are such that

,

then P(A') + P(B') = ..................

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If X follows binomial distribution with parameters n = 5, p and P (X = 2) = 9.P (X = 3), then p = ___________

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Let X be a random variable taking values x₁, x₂,..., x_n with probabilities p₁, p₂, ..., p_n, respectively. Then var (X) =