Simplify the expression using properties of exponents. 250-53-8
5045
O A Sab?
ОВ.
5ab9
Ос.
5
að?
5
6939
OD.

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?