Question

10 years ago 10 people age was33. after 3 years a person of age 40 dies. after another 3 years anothe person of 40years dies.after another 3 years another person of 27years dies. find the present average age

Answer 1

summation age =242
summation frequency = 7
x/f=242/7=>

34.571428...…
==34.57 //

Answer 2

10 year ago 10 people= 33
10 year ago total age=330
after 3 year 1 person with age 40 died = ie take his age as 37 before 3 years
lly for next 2 persons ; consider as 34 (40-6) and as 18(27-9) in 6 and 9 years ago( ie 37+34+18=89) 10 years ago age of 7 people =330-89=241 
nw consider present age 7*10=70+241=311
nw avg= 311/7=44.43(ans)