Question

The population of 8 villages is 900, 750, 1100, 1050, 835, 1250, 555, and 630. Find the population of Ninth village if the average population of Nine villages is 900.

(kindly explain it step by step)

Answer 1

let the ninth village be y
now average = sum of observations/no. of observations

{(900+750+1100+1050+835+1250+555+630+y)/(9)}=900

7070+x/9=900

7070+y=900x9

7070+x=8100

x=8100-7070

x=1030

so ninth village has a population of 1030