Given the following information, what is the standard deviation of stock A$?$

$\backslash$table$[[\backslash$table$[[$Economic Condition$],[$Stock B$]],$Probability,Return on Stock $A,$Return on$],[\backslash$table$[[$Slow growth$],[$Moderate growth$],[$Hiah arowth$]],\backslash$table$[[30\%$

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