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arithmetic mean
gen.	算術平均値 River and Water Resources Glossary (Infrastructure Development Institute Japan)
math.	平均 (heikin); 平均値 (heikinchi)
tech.	系列平均値 (けいれつへいきんち)
n arithmetic mean | n
math.	相加平均 (sōka-heikin); 算術平均 (さんじゅつへいきん)