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F (x) : 2. Find mean , variance 2; and standard deviation Of continuous r.v. Let X equal weight of a randomly selected quarter-pounder in pounds. What is P (0:20 < X < 0:30)? The probability density function (p.d.f.) Of a continuous r.v. Let f (x) = 3x2 for 0 < x < 1: 1. Is f (x) a valid p.d.f.?

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