On a number line, the coordinates of X, Y, Z, and W are -6, -4, 4 and, 8 respectively. Find the lengths of the two segments below. Then tell whether they are congruent.

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?