Advertisement
Question
There are three sections in school with 20, 40 and 40 students respectively. The average weight of a student in these sections, respectively, is 6, 2 and 4 Kg. What is the average weight of all the the students of the combined sections?
A
$3{3/5}$.
B
$3{61/100}$.
C
$3{59/100}$.
D
$3{29/50}$.
Soln.
Ans: a
Ans: a
The sums of the weights of all the students is 20 × 6 + 40 × 2 + 40 × 4 = 360. The required average = 360/total students = $360/{20 + 40 + 40}$ = ${18/5}$, which is same as: $3{3/5}$.