As a result of wrong posting of number of a student in examination as 83 instead of 63, average number of all students has been increased by \frac{1}{2}. How many students are there in the class?

Correct answer: 40

Explanation: ✅ Correct Answer: C) 40 📚 Explanation: The total increase in the sum of marks is 83 - 63, which equals 20. This total increase caused the average for all students to rise by 0.5. To find the number of students, we divide the total increase by the increase per student. Dividing 20 by 0.5 gives us a total of 40 students in the class.