If X and Y are independent random variables with means X = 9.5 and Y = 6.8

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If X and Y are independent random variables with means μX = 9.5 and μY = 6.8 and standard deviations σX = 0.4 and σY = 0.1, find the means and standard deviations of the following:
a. 3X
b. Y − X
c. X + 4Y
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