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23 December, 14:19

The systolic blood pressure of a group of 18-year-old women is normally distributed with a mean of 112 mmhg and a standard deviation of 11 mmhg. what percentage of 18-year-old women in this group have a systolic blood pressure that lies within 3 standard deviations to either side of the mean?

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  1. 23 December, 16:10
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    By the empirical rule, 99.7 percent of all values in a normal distribution lie within 3 standard deviations of the mean. Since the population is normally distributed, the percentage that lies within 3 standard deviations of the mean is 99.7 percent.

    Alternatively, you can use a z-score table to look up the area between - infinity and - 3 to get the percentage that lies below 3 standard deviations below the mean, and the rest of the calculations should be trivial.
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