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QUESTION

The mean income of a group of people is $500/week, and the standard deviation is $40. Using the Empirical Rule, find the percent of the incomes...

The mean income of a group of people is $500/week, and the standard deviation is $40. Using the Empirical Rule, find the percent of the incomes

a)   higher than $580.

b)   Les then $460.

c)    between $420 and $460.

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