I will help you out, but I'm not going to answer the question for you, because you should know these terms.
The mean in a set of data is the average. Add up all the numbers together and divide by how many ages there are total to find the mean.
Absolute deviation refers to the distance that the mean is from the other data points averaged together. Typing in absolute deviation on google will take you to glencoe, specifically a math page that explains in detail what absolute deviation means and consists of.
I can't see all the values to give a good example, but I hope now you know what you're doing.
Hope this helps!
