Mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively. The correct mean is
A
48
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B
82 12
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C
50
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D
80
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Solution
The correct option is C 50 Sum of 100 items = 49 × 100 = 4900 Sum of items added = 60 +70 +80 = 210 Sum of items replaced =40 +20 +50 = 110 New sum = 4900 -110 +210 = 5000 ∴Newmean=5000100=50