If 30 females from each park are above 80 years age then find the average of no. of females who are below or equal to the age of 80 years from all the parks.

total female population

= 150+200+350+450+500=1650

Female population above 80 years age

= 30×5=150

Required average = $frac{{1650 - 150}}{5} = 300$