MEAN FOR AN UN-GROUPED FREQUENCY DISTRIBUTION -
There are three methods or process of solving for mean of an un-grouped frequency distribution, which has been discussed below –
There are three methods – i) Direct Method
(f₁y₁ + f₂y₂ +………..+ fₑyₑ) Ʃ fᵢ yᵢ
Mean, ӯ = ------------------------- = -----------
(f₁ + f₂ + ……………+ fₑ) Ʃ fᵢ
ii) Assumed Mean Method
Ʃfᵢdᵢ
Mean = A + ----------
Ʃfᵢ
iii) Step Deviation Method
Ʃfᵢuᵢ
Mean, ӯ = A + h X ---------
Ʃfᵢ