・ 音 キン
Sino-Vietnamese: quân
Earth 土 for meaning, 匀 (even) for both sound and sense. Rake the ground until every part is level, and you have averaging: heikin, the average.
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テストの平均点は七十点でした。 (テストのへいきんてんはななじゅってんでした)
The average test score was seventy points.