STATISTICS:
In a study of 500 men, diastolic blood pressure was found to be approx. normally distributed, with a mean of 82mm of mercury and a standard deviation of 10mm.
Question: Use the 68-95-99.7% rule to determine what percentage of the test group had a diastolic pressure between 72mm and 92mm of mercury.

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draw the normal bell curve
|dw:1444168819721:dw|

at the center is the mean 82
|dw:1444168888474:dw|

plot 72 and 92 on there as well
|dw:1444168948036:dw|

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