Basically I have found myself stuck in a math problem, any possibilities for assistance?

I know this is java but I figured there must be a java programmer out there that knows how to solve this?

c=95%

In small NY towns (population < 30000) a sample of 22 libraries had 12600 books on average, with a standard deviation of 680. What can you say about the mean and the standard deviation of small town libraries generally?

Please show me how to solve this?