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Suppose $X$ is a random variable whose mean is $12.5$ and whose standard deviation is $2.1$.

Let $y = 6.2x – 7$.

What are the mean and the variance of $y$?

Mean $= 5.5$Variance $= 27.3$

Mean $= 70.5$Variance $= 13.02$

Mean $= 70.5$Variance $= 162.5$

Mean $= 70.5$Variance $= 169.5$

Mean $= 77.5$Variance $= 27.3$