1.

The mean and standard deviation of 20 items is found to be 10 and 2 respectively. At the time of checking it was found that one item 8 was incorrect. If it is replaced by 12, then find the mean and variance

Answer»

10.2, 4.01
10.1, 3.69
10.2, 3.96
10.2, 3.76

Answer :C


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