Originally Posted by

**i need a brain**
The local hardware store sells screws in 1lb bags. Because the screws aren't identical, the number of screws per bag, although **distributed normally**,varies with a** μ=115**, and **σ=6**.

A carpenter needs a total of 590 screws for a particular project. What is the probability that he will have enough screws if he buys five bags?

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I don't know why I have trouble calculating even the simplest probability problems, but they always confuse me. I've been trying to figure out how to do it but nothing that I get makes sense! I'm frustrated and I need to get the correct answer by tonight.

If anyone could point me in the right direction, I would be eternally grateful!

Thanks.