Then a=50× 16%=8, m=2050× 100%=40%, n = 450× 100% = 8%.

So the answers are: 8, 50, 40%, 8%;

(2) Complete the following statistical chart:

(3) The percentage of floret selected is:14×100% = 25%;

(4) 600× 16+450 = 240 (person).