1.

The mean of 100 items is 49. It was found that three items which should have been 60,70,80, were wrongly read as 40,20,50 respectively. The corrected mean is

Answer»

The mean of 100 items is 49. It was found that three items which should have been 60,70,80, were wrongly read as 40,20,50 respectively. The corrected mean is





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