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I have a very basic (not basic enough for me apparently) problem. I'm trying to find out on average how many times people have attended an event. There's a total of 12 events. Below is a simplified version of my table with number of events in the first column and number of people who attended one, two,..., twelve events in the second column. I'm not entirely sure how to do this, but would it just be \(\displaystyle (1*100 + 2*200 + ... + 12*1200) / (100 +200 + ... + 1200) \)? Any help for this new guy would be appreciated! Thank you!

1 100

2 200

3 300

4 400

5 500

6 600

7 700

8 800

9 900

10 1000

11 1100

12 1200