suppose that diastolic blood pressure readings of adult males have a bell-shaped distribution with a mean of 7979 mmhg and a standard deviation of 88 mmhg. using the empirical rule, what percentage of adult males have diastolic blood pressure readings that are between 7171 mmhg and 8787 mmhg?



Answer :

95% of adult males have diastolic blood pressure readings that are at least 71 and 87 mmHg

The empirical rule states that for a normal distribution, nearly all of the data will fall within three standard deviations of the mean . The empirical rule is further illustrated below

68% of data falls within the first standard deviation from the mean.

95% fall within two standard deviations.

99.7% fall within three standard deviations.

From the information given, the mean is 79 mmHg and the standard deviation is 88 mmHg.

2 standard deviations = 2 × 88 = 167

82 + 20 = 102 mmHg

Therefore, 95% of adult males have diastolic blood pressure readings that are at least 102 mmHg.

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