Shack Homebuilders Limited is evaluating a new promotional campaign that could increase home sales. Possible outcomes and probabilities of the outcomes are shown next. Additional Sales in Units 70 80 150 Possible Outcomes Ineffective campaign Normal response Extremely effective Probabilities @.20 e. 20 0.60 Compute the coefficient of variation. (Do not round intermediate calculations. Round your answer to 3 decimal places.) Coefficient of variation