Question

Class Interval Frequency (fi) Cumulative Frequency (F) 120-<130 1 1 130-<140 3 4 140-<150 8 12...

Class Interval

Frequency (fi)

Cumulative Frequency (F)

120-<130

1

1

130-<140

3

4

140-<150

8

12

150-<160

5

17

160-<170

3

20

∑fi = 20

1. Find the Coefficient of Variation

Homework Answers

Answer #1


Midpoint = (Upper class Limit + Lower class limit) / 2

Midpoint = (120+130)/2 = 125 (For, first class)

(130+140)/2 = 135 (For, second class)

and so on ...

Computational Table:

Mean =

Standard deviation = S =

Coefficient of Variation (CV) =

CV = (S / ) * 100

CV = (10.81 / 148)*100

CV = 7.30%

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