Home › Previous year questions › GATE 2025 MA › Question 3GATE 2025 MA – Question 3 General Aptitude · Quantitative Aptitude: Data Interpretation, Arithmetic and Number Computation · 1 mark · Multiple choice
A class average was 30.8, with one mark incorrectly entered as 24 instead of 42. Correcting it raises the average to 31.4. How many students are there?
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Show answer and explanation Correct answer: (C) 30
Explanation Correcting the mark adds 42−24 = 18 to the total. Mean increase is 31.4−30.8 = 0.6, so class size = 18/0.6 = **30, C**.
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