Find the rate that would be better to solve the problem. a painter can paint 4 rooms in 6 hours. how many rooms can he paint in 10 hours?
a. rooms/hours or b. hours/rooms

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?