There are only blue yellow and green cubes in a bag there are 3 times as many blue cubes than yellow there are 5 times as many green cubes than blue what is the probability of sarah taking a yellow cube out of the bag right your answer in simplest form that is the question i am stuck on and the homework is due in tommorrow someone me

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?