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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, the correct mean is?

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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, the correct mean is? Answer: 29.9

The mean of 100 items is 30, so the total sum of all items is: 30 x 100 = 3000 However, two items were wrongly taken as 32 and 12 instead of 23 and 11, which means the correct total sum should be: 3000 - 32 - 12 + 23 + 11 = 2990 Since there are 100 items, the correct mean is: 2990 ÷ 100 = 29.9 So, the correct answer is: 29.9

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.