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  3. a normally distributed population has a mean of 65

A normally distributed population has a mean of 65 and a standard deviation of 24. Sample...

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Statistics

A normally distributed population has a mean of 65 and astandard deviation of 24. Sample averages from samples of size 19are collected. What would be the lower end of the centered intervalthat contains 90% of all possible sample averages?

I know how to do a most of this, but I am confused on how I findthe Z variable. Thanks!

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