Question

Provide us the direct mean method​

Answer 1

Explanation:

Mean;- Summation fi×xi divided by summation fi.

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Answer 2

Explanation:

$zi = 1nt = sum \: of \: all \: the \: frequencies \: . \: this \: is \: also \: denoted \: by \: n \: i = 1nfixi = sum \: of \: the \: product \: of \: frequencies \: and \: corresponding \: observtion.$