mean

The mean is a measure of central tendency that is especially suited for quantitative variables.

The mean is often used in comnbination with the standard deviation to describe the characteristics of a sample.

sample mean

The (arithmetic) mean \(\overline{x}\) of a sample \(X = \{x_1, \ldots, x_n\}\) of size \(n\) is

\[\overline{x} = \frac{1}{n} \sum_{x=1}^{n} x_i\]

The mean of a population is notated with the Greek letter mu: \(\mu\). The calculation is equivalent with the sample mean.