The mean weight of 32 students in a school is 50 kg. If the weight of the teacher be included, the mean rises by 500 grams. Find the weight of the teacher.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 66.5 kg.
Total weight of students = 32 × 50 = 1600 kg
Total weight with the teacher
New mean = 50.5 kg
⇒ Total weight with teacher = 33 × 50.5 = 1666.5 kg
Teacher’s weight = 1666.5 − 1600 = 66.5 kg