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InterviewSolution
| 1. |
Mean of 100 items is 49. 'It was discoveredthat three item which should have been 60,70, 80 were wrongly read as 40, 20, 50respectively. The correct mean is: |
| Answer» <p>Mean of any observation = sum of all obsevation /Total no. of observationsum of all obsevation = Mean of any observation *Total no. of observationGivenMean of 100 items =49sum of 100 items = 49*100=4900Now since 60, 70 and 80 were wrongly read as 40, 20,50 so we subtract 40,20,50 frm the sum and add 60,70 80to get correct sum of 100 itemsCorrected sum of 100 items = 4900 -40-20-50+60+70+80 =5000Corrected mean of 100 items is =5000/100 =50</p> | |