Answer:
13.
Step-by-step explanation:
2, 3, 3, 7, 12, 14, 15, 18, 19, 20
3,3,7,12,14,15,18,19
3,7,12,14,15,18
7,12,14,15
12,14
^ Mean: 13
Uhh it's easy, did you really pay attention at ALL during the lesson. Literally don't judge on here but really!!!?
