How can the idea of unit rate help you think about problems in the real world?​

With finding limits of multi variable !

The product of sin 30 degrees and sin 60 degrees is same as the product of

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?