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Statement of a problem № m185

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According to the Internal Revenue Service, the mean tax refund for the year 2013 was $3,000. Assume the standard deviation is $450 and that the amounts refunded follow a normal probability distribution. a. What percent of the refunds are more than $3,100? b. What percent of the refunds are more than $3,100 but less than $3,500? c. What percent of the refunds are more than $2,250 but less than $3,500?




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