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Let X and Y be two independent random variables with μX =E(X)=2,σX =SD(X)=1,μY =2,σY =SD(Y)=3. Find...

Let X and Y be two independent random variables with
μX =E(X)=2,σX =SD(X)=1,μY =2,σY =SD(Y)=3.

Find the mean and variance of

(i) 3X
(ii) 6Y
(iii) X − Y

Math   Statistics-And-Probability   
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