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The mean diastolic blood pressure for a random sample of 80 people was 91 millimeters of mercury. If the standard deviation of individual blood pressure

The mean diastolic blood pressure for a random sample of 80 people was 91 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 9 millimeters of mercury, find a 99% confidence interval for the true mean diastolic blood pressure of all people. Then give its lower limit and upper limit

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