The average marks obtained by a group of 11 students is 53 and the average marks obtained by another group of 13 students is 48. What is the average marks obtained by all 24 students (approximately) ?

Correct option is B

Given:
Group 1: 11 students, Average marks = 53
Group 2: 13 students, Average marks = 48
Formula Used:
Weighted average = (Sum of all marks) / (Total number of students)
Solution:
Sum of marks for Group 1 = 11 * 53 = 583
Sum of marks for Group 2 = 13 * 48 = 624
Total marks = 583 + 624 = 1207
Total students = 11 + 13 = 24
Average marks = 1207 / 24 ≈ 50.29