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A sample of n = 25 has a M = 68 find the z-score for this sample if it came from: population mu = 60

A sample of n = 25 has a M = 68 find the z-score for this sample if it came from: population mu = 60 , SD=10: a population mu = 60 , SD = 20 a population mu = 60; SD=40

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