Holly records the temperature, in degrees fahrenheit, for two different cities. ln one of the cities, the temperature is 15 degrees above zero. holly records this as 15. ln the other city, the temperature is 15 degrees below zero.

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?