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 we say about the proportion of ratios that fall between
a. 11.5 and 15.5?
b. 9.5 and 17.5?
c. 7.5 and 19.5?
a. The interval contains approximately 68% of the ratios, according to the Empirical Rule.
b. The interval contains approximately 95% of the ratios according to the Empirical Rule.
c. The interval contains approximately 99.7% of the ratios according to the Empirical Rule.
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Indicate whether the statement is true or false.
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