Given that the mean of a set of data is 25 and the standard deviation is 3, what is the coefficient of variation?

A) 0.12
B) 12%
C) 8.33
D) 833%

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?