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Mean

The mean of t...

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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Similar questions

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

Q. 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. Find the correct mean.

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