Mary's bank account earns 4% simple interest per year. How much must she deposit in the account today if she wants it to be worth $1,000 in 5 years? Round your answer to the nearest dolla

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?