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Question
The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, correct mean is
Options
29.4
29.5
29.8
29.9
MCQ
Solution
29.9
Explanation:
Sum of 100 items = 30 x 100 = 3000
New sum = 3000 - (32 + 12) + (23 + 11) = 2990
∴ Correct mean = `2990/100` = 29.90
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