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 Ineffective campaign Normal response Extremely effective Compute the coefficient of variation. Additional Sales in Units Probabilities 30 0.40 110 0.40 120 0.20 Note: Do not round intermediate calculations. Round your answer to 3 decimal places. Coefficient of variation