Shack Homebuilders Limited is evaluating a new promotional campaign that could increase home sales. Possible outcomes anc probabilities of the outcomes are shown next.

$\backslash$table$[[$Possible Outcomes,Additional Sales in$,],[$Ineffective campaign,Units,Probabilities$],[$Normal response,$20,0\mathrm{.}40],[$Extremely effective,$110,0\mathrm{.}40]]$

Compute the coefficient of variation.

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

Coefficient of variation