Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If 2 data sets having 10 and 20 observations have coefficients of variation 50 and 60 respectively and arithmetic means 30 and 25 respectively, thenthe combined variance of those 30 observations is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Given,
n 1 = 10, 
= 30, CV 1 = 50
n 2 = 20, 
= 25, CV 2 = 60
CV 1 = 
x 100 
50 = 
x 100 
= 15
CV 2 = 
Combined mean = 
Combined variance = 
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