The formula for finding the volume of a cone is v = 1 3 πr2h. the radius of a cone is 5 cm and the height of a cone is 10 cm. what is the approximate volume of the cone?

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?