# Standard Deviation: Bell Shaped Distribution

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Suppose the data have a bell shaped distribution with a mean of 30 and a standard deviation of 5. Use the empirical rule to determine the percentage of data within each of the following ranges: 20 to 40, 15 to 45, and 25 to 35.

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The solution gives detailed steps on determining the percentage of data using empirical rule.

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20 to 40, since (40-30)/5=(30-20)/5=2 which means values lie within 2 standard deviations of the mean, by empirical rule, about 95.45% of the values lie within 2 ...

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