noun
population mean
Technical term in statistics referring to the mean of an entire population, as opposed to a sample mean.
母平均を推定するために標本調査を行う。
We conduct a sample survey to estimate the population mean.
このデータから母平均を計算することはできない。
It is not possible to calculate the population mean from this data.
Compound of 母 (mother, here meaning 'parent' or 'underlying') and 平均 (mean, average). The term is a direct translation of the English 'population mean'.