Compute the z-score for for a sample of scores

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Reference no: EM13134717

A normal- shaped distribution has a mean of 80 and standard deviation of 15.

a. What are the z-scores values that from the boundaries for the middle 95% of the distribution of sample means?
b. Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?

Reference no: EM13134717

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