Browse Questions

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

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

$SD =\sqrt {\sigma^2}$
$\qquad= \sqrt {121}$
$\qquad= 11$
Hence B is the correct answer.