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?

Question

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?

Quizplus · Accepted Answer

The Answer of 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?

The Price-Earnings Ratios of a Sample of Stocks Have a Mean