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 $600\mathrm{.}20$

Normal response $800\mathrm{.}20$

Extremely effective $1200\mathrm{.}60$

Compute the coefficient of variation.

Note: Do not round intermediate calculations. Round your answer to $3$ decimal places.