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

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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

Options:

A . 77 kg

B . 74 kg

C . 76 kg

D . 75 kg

Answer: Option C
Answer: (c)Weight of teacher = 50 + 26 × 1 = 76 kg Aliter : Using Rule 24,( If a new member is added in a group then. age (or income) of added member = Average (or income) ± x (n + 1) where x = increase (+) or decrease (–) in average age (or income) n = Number of members. ) Here, N = 50, T = 45, t = $1/10$ = 0.1 Weight of teacher = Average + × (n + 1) = 50 + 1 (25 + 1) = 50 + 26 = 76 kg

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