SOLUTION: The price-earnings (PE) ratios of a sample of stocks have a mean value of 12.25 and a standard deviation of 1.7. If the PE ratios have a bell shaped distribution, use the 68-95-99.

Question 1134242: The price-earnings (PE) ratios of a sample of stocks have a mean value of 12.25 and a standard deviation of 1.7. If the PE ratios have a bell shaped distribution, use the 68-95-99.7 Rule to estimate the percentage of PE ratios that fall between:

Answer by Glaviolette(140) (Show Source): You can put this solution on YOUR website!
I am not sure if there is part of the question missing or not, however, applying the 68-95-99.7 rule,
68% falls within 1 st dev = 12.25 - 1.7 and 12.25 + 1.7 or (10.55, 13.95)
95% falls within 2 st dev = 12.25 - 2(1.7) and 12.25 + 2(1.7) or (8.85, 15.65)
99.7% falls with 3 st dev = 12.25 - 3(1.7) and 12.25 + 3(1.7) or (7.15, 17.35)
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