Which of the following mathematical statements is NOT true? 1. logo 1 = 0
2.b = 1
3. (bm) (bn)=(bmn)
4.b1 = b​

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?