Exercise 7-19 (LO7-3)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? (Round the intermediate values to 2 decimal places. Round your answer to 2 decimal places.) Percent% b.What percent of the refunds are more than $3,100 but less than $3,500? (Round the intermediate values to 2 decimal places. Round your answer to 2 decimal places.) Percent% c.What percent of the refunds are more than $2,250 but less than $3,500? (Round the intermediate values to 2 decimal places. Round your answer to 2 decimal places.) Percent%
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