• According to the Internal Revenue Service, the mean tax refund for the year 2013 was $4,000. Assume the standard deviation is $550 and that the amounts refunded follow a normal probability distribution.
•  A) what percent of the refunds are more than $4,100?
•  B)what percent of the refunds are more than $4,100 but less than 4,500?
•  c) what percent of the refunds are more than $3,250 but less than $4,500?