Coleman graphed the relationship between the number of rotations of his front bike tire and the distance he traveled past a tree. Negative distance means the tree is in front of Coleman and positive distance
means the tree is behind Coleman

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?