The mean of 72 items found 63. If two items misread as27&9 instead 72&90 respectively. Find correct mean
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mean of 72 items=63
n
sum of 72 items =63×72
=4536
mis readed as 27&9 instead of 72&90
then new mean =4536-27-9+72+90/63
=74
n
sum of 72 items =63×72
=4536
mis readed as 27&9 instead of 72&90
then new mean =4536-27-9+72+90/63
=74
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