Let x denote the systolic blood pressure of an individual selected at random from a certain population. Suppose that the normal distribution with mean m 5 120 mm Hg and standard deviation σ = 10 mm Hg is a reasonable model for describing the population distribution of x. (The article “Oral Contraceptives, Pregnancy, and Blood Pressure,” Journal of the American Medical Association [1972]: 1507–1510, reported on the results of a large study in which a sample histogram of blood pressures among women of similar ages was found to be well approximated by a normal curve.)
x is more than 2.5 standard deviations from its mean value.

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