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6:27 For a distribution of 280 observations, mean = 54 and standard deviation = 3. On checking it was discovered that observations which should correctly

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6:27 For a distribution of 280 observations, mean = 54 and standard deviation = 3. On checking it was discovered that observations which should correctly read as 62 and 82 had been Wrongly recorded as 64 and 80 respectively. Calculate the correct 'values of mean and standard deviation

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