Average
Mean
noun, verbal noun
Something that's flat and equal to everything around it, all those flat things around it, are average. They're the mean (same as average).
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
2014年のセンター試験の平均点が出ました。
The average grade for 2014’s National Center Test for University Admissions was revealed.