Question: 4.66 Let X represent the number that occurs when a green die is tossed and Y the number that occurs when a red die is

4.66 Let X represent the number that occurs when a green die is tossed and Y the number that occurs when a red die is tossed. Find the variance of the random variable

(a) 3X − Y ;

(b) X + 5Y − 5.

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