Problem $13-4($Algo$)$ Coefficient of variation $[$LO$13-1]$

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

$\backslash$table$[[$Possible Outcomes,$\backslash$table$[[$Additional Sales$],[$In Units$]],$Probabilities$],[$Normal response,$60,0\mathrm{.}30],[$Extremely effective,$80,0\mathrm{.}50]]$

Compute the coefficient of variation.

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

Coefficient of variation