Question

Assume there are four students. The average weight of these students are 50kg.If the weight of Three students is40,70,30kg respectively. What is the weight of fourth student

Answer 1

average weight=50kg
let the weight of fourth student be x
since,average=sum of all observations/no.of observations
50=40+70+30+x/4
50*4=140+x
200=140+x
x=200-140
x=60
Ans.

Answer 2

60kg

7+4+3

20-14

6

60kg