Chiwerengero cha masamu ndi mtengo womwe nthawi zambiri umagwiritsidwa ntchito m'mawerengero, omwe amawerengedwa ngati kuchuluka kwa masamu azikhalidwe.
Ngati tili ndi seti ya
n
mfundo. Tiyeni tiwayitane
x1, x2, …, xn.
Kuti mupeze pafupifupi, onjezerani zonse
xi
ndikugawa zotsatira zake ndi
n.
\(
\overline{x} = \dfrac{x_1 + x_2 + ... + x_n}{n}
\)