52
Question
The mean of marks scored by 100 students was found to be 40. Later it was discovered that a score of 53 was misread as 83 . Find the correct mean
The mean of marks scored by 100 students was found to be 40. Later it was discovered that a score of 53 was misread as 83 . Find the correct mean
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Solution
mean =sum of observations / total num. of obs.
40= sum of observation / 100
4000 = sum of obser.
new mean = sum of obser. +53 -83 /100
new mean=4000-30 / 100
new mean = 39. 7
40= sum of observation / 100
4000 = sum of obser.
new mean = sum of obser. +53 -83 /100
new mean=4000-30 / 100
new mean = 39. 7
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