Posted by **Jessica** on Wednesday, November 14, 2012 at 5:57pm.

I have a test on this tomorrow and I swear he didn't teach this and the book's not helping either, so maybe u can:

A hwy engineer knows that his crew can lay 5 miles of hwy on a clear day, 2 miles on a rainy day, and only 1 mile on a snowy day. Suppose that the probabilities are as follows:

Outcome prob/random variable: clear .6/5, rain .3/2, snow .1/1

Find the mean (expected value) and the variance

Can anyone at least tell me where to start????

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