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).
Options:
A . 57 kg
B . 66 kg
C . 55 kg
D . 56 kg
Answer: Option D Answer: (d)Weight of the teacher = 42 kg. + ${35 × 400}/1000$kg = 42 + 14 = 56 kg. Aliter : Using Rule 24, Here, x = $400/100$ = 0.4, n = 34 Weight of teacher = Average + x (n + 1) = 42 + 0.4 (34 + 1) = 42 + 14 = 56 kg
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