Home › Previous year questions › GATE 2025 AG › Question 3GATE 2025 AG – 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?
25 28 30 32 Practise this question in The GATE Grind →
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**.
More Quantitative Aptitude: Data Interpretation, Arithmetic and Number Computation questions GATE 2025 AG Q8 – A fair six-sided die is rolled three times. Find probability of exactly one 6. GATE 2025 AG Q10 – A shop has four distinct ice-cream flavors. Any number of scoops per flavor is allowed and… GATE 2024 AG Q3 – Find the median of 9,18,11,14,15,17,10,69,11,13. GATE 2024 AG Q4 – Counts of ₹1,₹5 and ₹10 coins are in ratio 5:3:13. What percentage of the total money is… GATE 2024 AG Q8 – A 2000 kcal diet gets35% energy from carbohydrates,20% protein,20% unsaturated fat,20%… GATE 2023 AG Q7 – To construct a wall, sand and cement are mixed in the ratio of 3:1. The cost of sand and… All Quantitative Aptitude: Data Interpretation, Arithmetic and Number Computation questions →