The mean of marks scored by 100 students was found to be 40. Later on it was discovered
that a score of 53 was misread as 83. Find the correct mean.
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Answer:
the correct mean = 39.7
Step-by-step explanation:
MEAN = sum of observations ÷ no of observations
40 = sum of observations ÷ 100
sum of observations = 100×40
sum of observations = 4000
53 was misread as 83 so,
the correct mean = (4000 - 83 +53 ) ÷ 100
= 3970 ÷ 100
= 39.7
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