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**cassrl****Member**- Registered: 2012-10-03
- Posts: 4

X score is normally distibuted with mean 90 and standard deviation 23 Find:

A-the probability of a score between 76 and 117

b-probability that the mean score of a sample of n=64 is greater than 97

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,367

Hi cassrl;

I am getting for A) .608421 as the probability.

For B) you use the central Limit Theorem. Please try that now.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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