George has a small coin collection. he has collected 16 gold coins, 28 silver coins, 32 copper coins, and 4 bronze coins. at a flea market, george sells 15% of his coins. find the number of coins he sold.

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?