the mean of 72 items were found to be 63. if two of the items them misread as 27 and 9 instead of 72 and 90 respectively. find the correct mean.
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Margin in Misread of 27-> 72-27=+45
Margin in misreadof9 =90-9 =+81
Total change=+126
Total items=72
Change in mean =126/72=7/4=3.75
New mean =old mean + change in mean =66.75
Margin in misreadof9 =90-9 =+81
Total change=+126
Total items=72
Change in mean =126/72=7/4=3.75
New mean =old mean + change in mean =66.75
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