The mean and variance of 20 observations are found to be 10 and 4 , respectively. On rechecking, it was found that an observation 9 was incorrect and the correct observation was 11 . Then the correct variance is: [Jan. 8, 2020 (II)] (a) 3.99 (b) 4.01 (c) 4.02 (d) 3.98 | Numerade
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