In a frequency distribution

MATHEMATICS · Single correct · A Level · Mathematics · Data presentation and interpretation · Data presentation and interpretation

Problem

In a frequency distribution, the following summary values are known:

N=40

\sum f_i x_i=120

, and

\sum f_i x_i^2=460

. What is the population variance of the data? (a)

11.5

(b)

2.56

(c)

2.5

(d)

1.58