Question

how to find average
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Answer 1

formula of average is

$\frac{total \: sum \: of \: all \: numbers \: }{number \: of \: items \: present \: in \: the \: set}$

Answer 2

average =

$\frac{sum \: of \: all \: the \: observations}{total \: no. \: of \: observations}$