The mean and variance of 20 observations are found \( \mathrm{P}^{1...

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The mean and variance of 20 observations are found
\( \mathrm{P}^{12 \cdot 0} \) to be 10 and 4 , respectively. On rechecking, it was found that an observations 9 was incorrect and the
W. correct observations was 11. Then the correct variance is
(1) 3.98
(2) 3.99
(3) 4.01
(4) 4.02
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