sample mean

English

Wikipedia

Noun

sample mean (plural sample means)

1. (statistics) Given a random sample $\textstyle \mathbf{x}_{1},\ldots,\mathbf{x}_{N}$ from an $\textstyle n$-dimensional random variable $\textstyle \mathbf{X}$, a mean defined as
$\mathbf{\bar{x}}=\frac{1}{N}\sum_{k=1}^{N}\mathbf{x}_{k}.$