Mean, Variance, and Standard Deviation. Mean is the average of all your numbers. The other 2 are more of a measurement of spreads and change. If you are using Excel spreadsheets, they have a function for all 3 of those.
If you want to see the math behind the stats, here is your number set:
Mean, Variance, and Standard Deviation
Enter the number set above and press Calculate. Let me know if you have questions.
For economics, statistics are used to measure averages, trends, and odd deviations given certain circumstances. I'd learn and utilize these 3, and then graduate to more advanced measurements when you feel comfortable with these 3.