Can someone help me with this problem ?

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

We just started the introduction into circles and i have no idea how to do this.

The table showed price paid per concert ticket on a popular online auction site. what was the average price paid per ticket