The average weight of 40 students of a school is 52 kg. If the weight of the teacher is included, the average weight rises by 500 grams. Find the weight (in kg) of the teacher.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4. i.e. 72.5.
Given that
The average weight of 40 students of a school is 52 kg
After including the teacher the average weight of 41 members increased by 500 grams
We know that,
New average weight = Old average weight + Net members × increased weight
New average weight = 52 + 41 × 0.5 = 72.5 kg