Question

the average monthly income of a team of four members is Rs 7500. One of the members left the team. So, the new average monthly income of the team came down to Rs 6330. What was the income of the member who left the team?

Answer 1

average =sum of observations/no.of observations
7500=sum of observations/4
(cross multiplying)
sum of observations= 4X7500
sum of observations=30000
let the person income who left team be x
so average=30000-x/4-1
6330=30000-x/3
(cross multiplying)
6330X3= 30000-x
18990=30000-x
x= 30000-18990
x=11010
»»person income who left team=11010

Answer 2

Total monthly income of 4 team members = 7500*4 = 30,000

Total monthly income of 3 team members = 6330*3 = 18,990

Monthly income of the member whi left the team = (30,000 - 18,990) = 11,010