the mean of 200 observation was 50. later on, it was discovered that the two items were misread as 92 and 8 instead of 192 and 88. find the correct mean?
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Mean =sum of observation ÷no. Of observation
According to first statement
Sum=280
As instead of 14,24 was misread,so we have to subtract 24 from 280
280-24=256
Then,we add correct observation i.e 14 in 256
256+14=270
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