Question

arithmetic mean of marks of 30 candidate was 40 Later on the it was found that a score of 47 was misread as 74 find the correct arithmetic mean???

please answer the question..​

Answer 1

Answer:

mean = sum of observations / number of observations

40 = sum / 30

sum = 40x30 = 1200

but this is incorrect as score of 47 was misread as 74

correct sum = 1200 - 74 + 47 = 1227

correct mean = 1227/30 = 40.9

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