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Questions  >>  CBSE XI  >>  Math  >>  Statistics
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Q)

There are 60 students in a class .The following is the frequency distribution of the marks obtained by the students in a test : where x is a positive integer . Determine the mean and standard deviation of the marks.

$\begin{array}{1 1}(A)\;1.122\\(B)\;5\\(C)\;7\\(D)\;15\end{array} $

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