Question 1 of 5 Factor the following polynomial completely.
21x5y4 – 1877y3 + 15x2y5
O 3x5y4(7x3y – 6x2 + 5y)
O 3x3y2(6x3y – x2 + 3y2)
O 3x2y3 (6x2y2 – 14 + 3y4)
3.x2y3 (7x3y – 605 + 5y2)

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?