The mean of the followlng frequency table is 53. But the frequencies f₁ and f₂ in the classes 20−40 and 60−80 are missing. Find the missinq frequencies.
Age (in years) 0-20 20-40 40-60 60-80 80-100 Total
No. of people 15 f₁ 21 f2 17 100
a. f₁ = 20, f₂ = 28
b. f₁ = 17, f₂ = 19
c. f₁ = 19, f₂ = 25
d. f₁ = 18, f₂ = 29