The asset turnover ratio $($ATR$)$ is the ratio of a company$$s revenues to the value of its assets $($indicating its efficiency in deploying its assets$).$ We should not use the standard deviation to compare ATR variation among industrial sectors because firms with large asset bases $($e$.$g$.,$ utilities, financial$)$ typically have lower mean ATR than, say, retail firms.

Retail Utilities Financial

Mean $1\mathrm{.}90800\mathrm{.}04590\mathrm{.}0803$

St Dev $0\mathrm{.}45100\mathrm{.}00820\mathrm{.}0201$

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$($a$)$ Use the sample data to calculate the coefficient of variation for each sector. $($Round your answers to $2$ decimal places.$)$