The table below represents the age of customers at a local movie theater. If a customer is selected at random, find the probability that the customer will be in the age group 15-19. Round your answer to four decimal places.

Age Groups	Frequency
5 - 9	7
10 - 14	3
15 - 19	8
20 - 24	3
25 - 29	5
30 - 34	5