The data of women's heights can be presented by the following diagram:

In the normal distribution, only 0.0063% of the population is not within 4 standard deviations of the mean. Those are shown as red points and lie above 184 cm or below 136 cm.

**Since any normal distribution is symmetric, then (0.0063/2)% lie above 184 cm (5 pers.) and (0.0063/2)% lie below 136 cm (must be 5 pers. as well). 5+ 5 = 10 **.

Note, that 99.9937% of the data are within 4 standard deviations of the mean. Those are shown as blue points and lie between 136 cm and 184 cm.