The standard deviation of 4, 7, 10, 13, 16, 19, 22 is

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Solution

The correct option is B 6
$G i v e n o b s e r v a t i o n s a r e i n A . P . H e r e 2 n + 1 = 7 . ∴ n = 3 d = 3 ∴ σ = \sqrt{\frac{3. (4)}{3}} .3 = 6.$

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