Average weight of 25 students of a class is 50 kg. If the

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Average weight of 25 students of a class is 50 kg. If the weight of the class teacher is included, the average is increased by 1 kg. The weight of the teacher is

1. 76 kg
2. 77 kg
3. 74 kg
4. 75 kg

Correct Option: A

Average weight of 25 students = 50 kg
If the weight of the class teacher is included, the average is increased by 1 kg .
Total increase in weight = 26 × 1
∴ Weight of teacher = 50 + 26 × 1 = 76 kg
Second method to solve this question with the help of given formula :

Here, N = 50, T = 45, t =	1	= 0.1
	10

Weight of teacher = Average + × (n + 1)
Weight of teacher = 50 + 1 (25 + 1)
Weight of teacher = 50 + 26 = 76 kg