The average weight of 17 students is 53 kg. After including a new student in that group the average weight rises by 2 kg. What is the weight of the new student?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 89 kg.
We know that,
Average = Sum of observations/Number of observations
The sum of the weight of 17 students = 17 × 53 = 901
After including a new student in that group the average weight rises by 2 kg
The sum of the weight of 18 students = 18 × 55 = 990
Thus,
The weight of new student = 990 - 901 = 89 kg