Calculate Mean Of Distribution Given Below Using Short Cut Method

Calculate the mean of the distribution given below using the short cut method.

Answers:

Assumed mean (Ai) = 45.5

Σf_i = 50, Σf_id_i = 70.

Mean = Ai + Σf_id_i/sf_i

= 45.5 + 70/50

= 45.5 + 1.4 = 46.9.