Mean of 6 observation was found to be 40 .Later on, it was detected that in one of the observation, 82 was misread as 28 . Find the correct mean.
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Wrong mean = 40
Wrong total = 240(6×40)
Correct total = 240 + correct observation - wrong observation
= 240 + 82 - 28
= 294
Correct mean = correct total/ no. of observations
= 294/6
= 49
Wrong total = 240(6×40)
Correct total = 240 + correct observation - wrong observation
= 240 + 82 - 28
= 294
Correct mean = correct total/ no. of observations
= 294/6
= 49
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6
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