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6:26 The mean and standard deviation of 20 items is found to be 10 and 2 respectively. At the time of checking it was found

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6:26 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. Calculate the mean and standard deviation, if (i) the wrong item is omitted, and (ii) it is replaced by 12

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