Rocnfeld Corp believes the following protabilty distnbution exists for its stock. What is the standar devation of the company's stock?

$\backslash$table$[[\backslash$table$[[$State of$],[$the$]],\backslash$table$[[$Probability$],[$of State$]],\backslash$table$[[$Stock$\text{'}$s$],[$Expected$]]],[$Economy$,$Occurring,Return$],[$Boom$,0\mathrm{.}05,2546],[$Normal$,050,15\%$