- #1

snoggerT

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**The mean and standard deviation of a random variable x are -11 and 4 respectively. Find the mean and standard deviation of the given random variables:**

1) y=x+7

2) v=8x

3) w=8x+7

1) y=x+7

2) v=8x

3) w=8x+7

**2. Homework Equations : E(x) = u, E(ax+b) = aE(x)+b**

## The Attempt at a Solution

I've gotten the standard deviations for these problems, though I'm still not sure why they are what they are. I can't figure out how to find the mean though. Can somebody please explain all of this to me? thanks.