Shack Homebuilders Limited is evaluating a new promotional campaign that could increase home sales. Possible outcomes and probabilities of the outcomes are shown next.

Possible Outcomes	Additional Sales in Units			Probabilities
Ineffective campaign		30			0.40
Normal response		110			0.40
Extremely effective		120			0.20

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