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Can someone help me solve this question in my textbook, I cannot figure out how they got the answer Say that the mean height of

Can someone help me solve this question in my textbook, I cannot figure out how they got the answer

Say that the mean height of American boys aged 10 is 55 inches (hypothetical value)with a standard deviation of 4.4. the mean height of 125 10 year old boys in the sample is 54.1 with a standard deviation of 3.2. compute for the z-score

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