Pre cal (math analysis) explaination/ help?!?

chj

New member
could someone explain how to solve the problem?...

A set of data the size N=100 is normally distributed with a mean of 50 and a standard deviation of 5. Determine the interval about the sample mean that has a 1% level of confidence.

Find the standard error of the mean for if the standard deviation equals 8 and N=100.

Thanks in advance for any help offered.
 
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