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Let X and Y be two independent random variables with the following means and standard deviations. mean standard deviation X. 20. 3 Y 45. 4

Let X and Y be two independent random variables with the following means and standard deviations.

mean standard deviation

X. 20. 3

Y 45. 4

A.Find the mean of X+Y.

b.Find the standard deviation of X+Y

C Find the mean of 2X+4

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