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1. Suppose that X is a random variable with x = 50 and ox = 3, and suppose that Y is a random variable

1. Suppose that X is a random variable with x = 50 and ox = 3, and suppose that Y is a random variable related to X by the equation Y = -2X+10. Find y and oy. 2. Suppose that X, Y are random variables with x = y=8, ox= 1.2 and oy = 0.9, and suppose that Z is a random variable satisfying the equation Z = X + Y. Find z and, assuming that X and Y are independent, find oz.

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