The random variable X has probability distribution as shown in the table: 1 2 3 4 5

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The random variable X has probability distribution as shown in the table: 1 2 3 4 5 P(X-x) 0.1 0.3 0.2 0.3 0.1 Find

(a) = E(X),

(b) E(X2),

(c) Var(X),

(d)

a, the standard deviation of X.

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