set the frequency density to be 1 each big square
tiny drum
set the frequency density to be 1 each big square
work out area from 90 to 165
area is proportional to frequency
so A = kf
area from 90 to 165 = k * 130
work out k
then work out the whole area from 0 to 270
that area = k * f
so uc an work out the total frequency of apples and then aftrer that its just ratios