The empirical rule you're referring to is the 68-95-99.7 rule, which asserts that for a normal (bell-shaped) distribution, approximately 68% of the distribution lies within 1 standard deviation of the mean; 95% lies within 2 standard deviations of the mean; and 99.7% lies within 3 standard deviations of the mean.
Let [tex]X[/tex] be the random variable denoting vehicle speeds along this highway. We want to find [tex]P(61<X<79)[/tex]. To use the rule, we need to rephrase this probability in terms of the mean and standard deviation.
Notice that [tex]61=70-9=70-3\cdot3[/tex], and [tex]79=70+9=70+3\cdot3[/tex]. In other words, 61 and 79 both lie exactly 3 standard deviations away from the mean, so [tex]P(61<X<79)\approx99.7\%[/tex].
