Sam Sung is evaluating a new advertising program that could increase electronic sales. Possible outcomes and probabilities of the outcomes are shown below.

Possible Outcomes	Additional Sales in Units			Probabilities
Ineffective campaign		50			0.20
Normal response		155			0.40
Extremely effective		345			0.40

Compute the coefficient of variation. (Do not round intermediate calculations. Round the final answer to 3 decimal places.) Coefficient of variation?