General Knowledge Economy

Coefficient of variation is 

1
\(\rm \frac{Mean}{St.\ Deviation}\times100\)
2
\(\rm\left( \frac{St.\ Deviation}{Mean}\right)^2\)
3
\(\rm 100\div \frac{Mean}{St. \ Deviation}\)
4
\(\rm \frac{St. \ Deviation}{Mean}\div 100\)

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