In the united states in 2000, withdrawals of water totaled 408 billion gallons per day. if freshwater withdrawals were 85 percent of the total, how many billions of gallons of freshwater per day was withdrawn?

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?