The average weight of a class of 13 students is 60 kg. If 2 new students of weight 42 kg and 48 kg are added to the class, then what will be the new average weight of 15 students?

Correct option is D

Given:
Average weight of 13 students = 60 kg
Weight of 2 new students = 42 kg and 48 kg
Total number of students after adding = 15
Formula Used:
Average weight formula:
Average =  $$\frac{\text{Total Weight of all students}}{\text{Total Number of students}}$$​​

New average = $$\frac{\text{Initial Total Weight} + \text{Weight of New Students}}{\text{New Total Number of Students}}$$​​
Solution:
Initial total weight of 13 students:
Total Weight = $$13 \times 60$$​ = 780 kg
Total weight of the 2 new students:
Total Weight of New Students = 42 + 48 = 90 kg
New total weight:
New Total Weight = 780 + 90 = 870 kg
New average weight:
New Average = $$\frac{870}{15}$$​ = 58 kg
Thus, the correct option is (d) ₹58 kg