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4) The first three groups of a frequency distribution of 400 observations are 0 -50, 50 - 100, 100-150, The arithmetic mean is 140. Further

4) The first three groups of a frequency distribution of 400 observations are 0 -50, 50 - 100, 100-150, The arithmetic mean is 140. Further scrutiny of the raw data reveals that three figures, 83, 246 and 289 had wrongly been taken as 38, 64 and 189 when preparing the frequency distribution. Determine the correct arithmetic mean

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