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The pulse rates of 145 randomly selected adult males vary from a low of 38 bpm to a high of 110 bpm. Find the minimum

The pulse rates of 145 randomly selected adult males vary from a low of 38 bpm to a high of 110 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 95% confidence that the sample mean is within 4 bpm of the population mean.

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