The variance of the data $2, 4, 6, 8, 10$ is

  • A

    $6$

  • B

    $7$

  • C

    $8$

  • D

    None of these

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What is the standard deviation of the following series

class $0-10$ $10-20$ $20-30$ $30-40$
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$\begin{array}{|l|l|l|l|l|l|l|} \hline X & 2 & 3 & 4 & 5 & 6 & 7 \\ f & 4 & 9 & 16 & 14 & 11 & 6 \\ \hline \end{array}$

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