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 40 0.30

Normal response 100 0.30

Extremely effective 120 0.40

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