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Q1.

The variance of the numbers $8,21,34,47, \ldots, 320$ is

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Q2.

The mean and standard deviation of 20 observations are found to be 10 and 2 . respectively. On rechecking, it was found that an observation by mistake was taken 8 instead of 12. The correct standard deviation is

(A)

1.8

(B)

1.94

(C)

$\sqrt{3.96}$

(D)

$\sqrt{3.86}$

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