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Question

The mean of 100 items was found to be 64. Later on it was discovered that two items were misread as 26 and 9 instead of 36 and 90 respectively. The correct mean is 
(a) 64.86 
(b) 65.31 
(c) 64.91 
(d) 64.61 


Solution

ANSWER:
(c) 64.91Mean of 100 items = 64
Sum of 100 items = 64×100=6400
Correct sum = (6400 + 36 + 90 - 26 - 9) = 6491
Correct mean=6491100=64.91

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