The mean of 150 items was 60.But it is discovered that one item was wrongly taken as 56 instead of 65.Find the correct value of mean.
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given mean of 150 items =60
sum of 150items =150×60
=9000
item 56 misread as 65
therefore, new sum =9000-65+56
=8991
new mean =8991/150
=59.94
correct value of 150 items = 59.94
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