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If the variance of a data is 121, then the standard deviation of the data is _______

$\begin{array}{1 1}(A)\; 55 \\(B)\;11 \\(C)\;97 \\(D)\;27 \end{array} $

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$SD =\sqrt {\sigma^2}$
$\qquad= \sqrt {121}$
$\qquad= 11$
Hence B is the correct answer.
answered Jul 9, 2014 by meena.p

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