The arithmetic average or mean: the total divided by the number of items; commonly used for scores, measurements, etc.
クラスの平均点は75点だった。
The class average score was 75 points.
日本の平均寿命は年々延びている。
Japan's average life expectancy has been increasing year by year.
データを平均して傾向を見よう。
Let's average the data to see the trend.
Balance or equilibrium; used (sometimes more literary) to indicate a state of being evened out or balanced.
収支のバランスを考えて、支出を平均させる必要がある。
Considering the balance of income and expenses, it's necessary to even out the expenditures.
市場は一時的に乱高下したが、やがて平均を取り戻した。
The market fluctuated temporarily, but eventually returned to equilibrium.