Al Bundy is evaluating a new advertising program that could increase shoe sales. Possible outcomes and probabilities of the outcomes are shown below.
Possible Outcomes Additional Sales in Units Probabilities
Ineffective campaign 85 .20
Normal response 155 .40
Extremely effective 315 .40
Compute the coefficient of variation. (Do not round intermediate calculations. Round your answer to 3decimal places.)
Coefficient of variation= __________