Discussion of Question with ID = 043 under Averages

This is the discussion forum for this question. If you find any mistakes in the solution, or if you have a better solution, then this is the right place to discuss. A healthy discussion helps all of us, so you are requested to be polite and soft, even if you disagree with the views of others. The question and its current solution has also been given on this page.

Advertisement

Question

There are three sections in school with 20, 40 and 30 students respectively. The average weight of a student in these sections, respectively, is 2, 5 and 2 Kg. What is the average weight of all the the students of the combined sections?

A

$3{1/3}$.

B

$3{31/90}$.

C

$3{29/90}$.

D

$3{14/45}$.

Soln.
Ans: a

The sums of the weights of all the students is 20 × 2 + 40 × 5 + 30 × 2 = 300. The required average = 300/total students = $300/{20 + 40 + 30}$ = ${10/3}$, which is same as: $3{1/3}$.


Comments and Discussion