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Question
If the mean and coefficient of variation of a data are 4 and 87.5% then the standard deviation is
Options
3.5
3
4.5
2.5
Solution
3.5
Explanation;
Hint:
`bar(x)` = 4, coefficient of variation = 87.5%
C.V. = `sigma/bar(x) xx 100`
⇒ 87.5 = `sigma/4 xx 100`
σ = `(87.5 xx 4)/100`
⇒ = 3.5
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