The price-earnings ratios of a sample of stocks have a mean value of 13.5 and a standard deviation of 2. If the ratios have a bell-shaped distribution, what can be said about the proportion of ratios that fall between 11.5 and 15.5?

Select one:

a.None of the suggested answers are correct.

b.The interval contains approximately 99.7 of the ratios according to the Empirical Rule.

c.The interval contains approximately 95% of the ratios according to the Empirical Rule.

d.The interval contains approximately 68% of the ratios, according to the Empirical Rule.

e.The interval contains approximately 89.9 of the ratios according to the Empirical Rule.