You plant 30 african violet seeds and 9 of them sprout use experimental probability to predict how many will sprout if you plant 20 seeds

Given that out of 30 planted seeds only 9 of the m sprouted, then:

Experimental probability = (number of occurrence of event) / (total number of trials made)

=9/30

=3/10

thus the number of seeds that will sprout given that 20 seeds we planted will be:

3/10*20

=6 seeds