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Sachin kaushik

· started a discussion

· 1 Months ago

sachin (Question: 180836.0 )

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Question:
A group of 30 students have average weight of 67 kgs. Five students of average weight 87 kgs join the group and five students of average age 56 kgs leave the group. What is the new average of the group?
Options:
A) 71.4 kg
B) 72.1 kg
C) 73.23 kg
D) 77.4 kg
E) None of these
Solution:
Ans. (b) Weight of 30 students = 30 × 67 = 2010 kg

Weight of 5 students who join the group = 5 × 87 = 435 kg

Weight of 5 students who leave the group = 5 × 56 = 280 kg

New average = \(\cfrac{2010+435-280}{30}\)     

= \(\cfrac{2165}{30}\) = 72.1 kg

Knowledge Expert

· commented

· 1 Months ago

Dear Student,the correct explanation has been provided.Do re-read it.Keep Learning with Us.
Best Wishes.
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