Problem $9-3$ Total Risk $($LG$9-3)$

Rank the following three stocks by their level of total risk, highest to lowest. Rail Haul has an average return of $10$ percent and standard deviation of $30$ percent. The average return and standard deviation of Idol Staff are $13$ percent and $40$ percent; and for Poker$-$R$-$Us they are $7$ percent and $35$ percent.

$\backslash$table$[[$Rank$,$Stock$],[1,$Rail Haul$],[2,$Idol Staff$],[3,$Poker$-$R$-$US$]]$