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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.
