Sample mean

The sample mean is the arithmetic average of n observed values, obtained by summing them and dividing by the sample size. It estimates the population mean from a sample.

X ˉ = \frac{1}{n} i = 1 \sum n X_{i}

\bar{X} = \frac{1}{n} \sum_{i=1}^{n} X_i

What the symbols mean

$X ˉ$	sample mean
$n$	number of observations in the sample
$X_{i}$	the i-th observed value (random variable) in the sample

About this formula

FieldStatistics
TopicDescriptive statistics
LevelHigh school
Also calledaverage, arithmetic mean, sample average, mean of a sample, average formula, xbar formula
SourceWikidata Q105675280

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