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Descriptive Statisticshard
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If XXX and YYY are independent random variables with variances σX2=9\sigma_X^2 = 9σX2​=9 and σY2=16\sigma_Y^2 = 16σY2​=16, what is the variance of the random variable Z=3X−2Y+5Z = 3X - 2Y + 5Z=3X−2Y+5?