alleryFor 50 students with mean score 60 and variance 25, the coefficient of variation (sigma/mean × 100%):
A5%
B8.33%
C20%
D41.67%
Answer & Solution
Correct answer: B. 8.33%
sigma = sqrt(25) = 5. CV = (5/60) × 100% = 8.33%.
Useful for comparing variability of distributions with different means.
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