Question: explain in detail The Standard deviation is $40. The mean income of a group of people is $500/ week . Assuming a bell shaped symmetrical

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explain in detail

The Standard deviation is $40. The mean income of a group of people is $500/ week . Assuming a bell shaped symmetrical curve for the data find the percent of the incomes a Smaller than $460 b. between $ 420 and $ 460 c. higher than $580

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