## Elementary Statistics (12th Edition)

Coefficient of variation=$\frac{standard \ deviation}{mean}$ By using the results from before: $cv_{O}=\frac{standard \ deviation}{mean}=\frac{523.21}{653.87}=0.8001=80.01$% $cv_{M}=\frac{standard \ deviation}{mean}=\frac{418.42}{458.53}=0.9125=91.25$% The variation for Obama is less.