Calculate the area of triangle WXY with altitude YZ, given W (2, -1), X (6,3), Y (7,0), and Z (5,2). 8 square units
9.4 square units
7.7 square units
12 square units

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?