13)
simplify.
(m + 11) + (n + 44)
a) m + n + 84
b) m + n + 55
c) mn + 55
d) mn + 484

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?