The average weight of 35 students in a class is 40 kgs. Five of the students of this class whose average weight is 42 kgs left the class. Find the average weight of the remaining 30 students.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. kg.
We know that,
Average = Sum of observations/Number of observations
Now,
Sum of the weight of 35 students = 35 × 40 = 1400 kg
Sum of the weight of 5 students = 5 × 42 = 210 kg
Now,
Total weight of remaining students = Total weight of 35 students − Total weight of 5 students
⇒ 1400 - 210 = 1190 kg
So,
Average = 1190/30 = kg