What are the coordinates of the midpoint of the line segment with endpoints r(4, −7) and s(−3, 5) ? enter your answer as a decimal or integer in the boxes. ( , )

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?