4. suppose you have two credit cards. the first has a balance of $410 and a credit limit of $1,000. the second has a balance of $510 and a credit limit of $1,000. what is your overall credit utilization?

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?