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The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 grams. Find the weight of the teacher (in kg).
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- 55 kg
- 57 kg
- 66 kg
- 56 kg
- 55 kg
Correct Option: D
According to question ,
| Weight of the teacher = 42 kg. + | kg | |
| 1000 |
Weight of the teacher = 42 + 14 = 56 kg.
Second method to solve this question with the help of given formula :
Here, y = 400 ÷ 100 = 0.4 , n = 34
Weight of teacher = Average + x (n + 1)
Weight of teacher = 42 + 0.4 (34 + 1)
Weight of teacher = 42 + 14 = 56 kg
