Which of the following represents (1 x 6) + (104 x 6) = 630
(1 x 6) x (104 x 6) = 3,744
6(104) = 624
6(104 ) = 618

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?