The mean and variance of 10 numbers were calculated as \( 11.3 \) a...

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The mean and variance of 10 numbers were calculated as \( 11.3 \) and \( 3.3 \) respectively. It was subsequently found that one of the a number was misread as 10 instead of 12 . How does the variance
\( \mathrm{P} \) change.
(1) variance decreases
(2) variance increases
W
(3) nothing can be said about variance
(4) variance remains unchanged.
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