In a certain​ chemical, the ratio of zinc to copper is 3 to 16. A jar of the chemical contains 608 grams of copper. How many grams of zinc does it​ contain?

Answer this question only if you know the 30 points and

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?

Ineed to find the answer to number 2