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The heart rates (in beats per minute) of 41 randomly selected finishers of the Chicago Marathon,...

The heart rates (in beats per minute) of 41 randomly selected finishers of the Chicago Marathon, five minutes after they completed the race, had sample mean x = 132 and sample variance s2 = 105. Assuming that the heart rates of all finishers of the Chicago Marathon five minutes after completing the race are normally distributed, obtain a 95% confidence interval for their mean.

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