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
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.