Question

If the mean of frequency distribution is 8.1 and Σf_ix_i = 132 + 5k, Σf_i = 20, then k =

(a) 3
(b) 4
(c) 5
(d) 6

Answer 1

Given:

Σf_ix_i = 132 + 5k, Σf_i = 20 and mean = 8.1.

Then,

Hence, the correct option is (d).