GATE CS 2025 Set 1 — Question 3
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General Aptitude → Quantitative Aptitude → Elementary Statistics & Probability
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Question
The average marks obtained by a class in an examination were calculated as . However, while checking the marks entered, the teacher found that the marks of one student were entered incorrectly as instead of . After correcting the marks, the average becomes . How many students does the class have?
Correct answer
(C) 30
Solution
Let be the number of students in the class.
Initial total marks = The error was entering instead of . The correction adds marks to the total.
Corrected total marks = New average =
The class has students.
Initial total marks = The error was entering instead of . The correction adds marks to the total.
Corrected total marks = New average =
The class has students.
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