(Answered) The price-earnings ratios of a sample of stocks have a mean

Statistics

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 poportion of ratios that fall between 9.5 and 17.5?

A) approx 68%

B) approx 95%

C) approx 99.7 %

D approx 75%

E) appox 89%

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