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 20 0.40 Normal response 110 0.40 Extremely effective 140 0.20 Compute the coefficient of variation. Note: Do not round intermediate calculations. Round your answer to 3 decimal places