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Question

The mean of the marks scored by 50 students was found to be 39. Later on it was discovered that a score of 43 was misread as 23. The correct mean is
(a) 38.6
(b) 39.4
(c) 39.8
(d) 39.2

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Solution

ANSWER:
(b) 39.4
Mean of the marks scored by 50 students = 39
Sum of the marks scored by 50 students = 39×50=1950
Correct sum = (1950 + 43 - 23) = 1970
∴Mean=197050=39.4

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