Compute z-score for a sample of twenty five score

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A normal-shaped distribution has µ=80 and σ=15. What are the z-score values that form the boundaries for the middle 95% of the distribution of sample means? 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: EM13143421

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