Question

Choose the correct answer in each of the following questions:
The class marks of a frequency distribution are 15, 20, 25, 30, .... The class corresponding to the class mark 20 is
(a) 12.5-17.5
(b) 17.5-22.5
(c) 18.5-21.5
(d) 19.5-20.5

Answer 1

NSWER:
(b) 17.5 - 22.5
We are given frequency distribution 15, 20, 25, 30,...
Class size = 20 - 15 = 5
Class marks = 20-5/2 -----------20+5/2

Thus, the required class is 17.5 - 22.5.