Can you show me how to solve this?

2: Last year, the typical college student graduated with $25,800 in debt (The Boston Globe, May 27, 2012). Let debt among recent college graduates be normally distributed with a standard deviation of $5,000..

a.

What is the probability that the average debt of two recent college graduates is more than $28,000?

b.

What is the probability that the average debt of two recent college graduates is more than $33,000?