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William
In a certain manufactured metal, the proportion X of impurities per unit weight is a random variable with mean E(X) = .12 and Var(X) = .0004?
The dollar value of each metal per unit weight is W = 20 - 11.5X. Find the mean and the variance of W.
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Here is a link to the video (3 minutes):
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www.learninglikecrazy.com
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