Mrs riggs got got some money for his birthday. he spent 1/5 of it on dog treats. then, he divided the remainder equally among his 3 favorite charity's. what fraction of his money did each charity receive, and if he donated $60 to each charity, how much money did he get on his birthday?

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?