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The mean and variance of 20 observations are found to be 10 and 4 respectively. On rechecking, it was found that an observation which was 11 was incorrectly recorded as 9. If the correct variance is V, then the value of [V] is

Answer» The mean and variance of 20 observations are found to be 10 and 4 respectively. On rechecking, it was found that an observation which was 11 was incorrectly recorded as 9. If the correct variance is V, then the value of [V] is


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