SOA Exam P Question 19 | Conditional Probability

An auto insurance company insures drivers of all ages. An actuary compiled the
following statistics on the company’s insured drivers:
Age of Driver Probability of Accident
16-20
21-30
31-65
66-99
Portion of Company’s Insured Drivers
0.06
0.03
0.02
0.04
0.08
0.15
0.49
0.28
A randomly selected driver that the company insures has an accident.
Calculate the probability that the driver was age 16-20.
(A) 0.13
(B) 0.16
(C) 0.19
(D) 0.23
(E) 0.40

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[shehandesilva]

Hi can I know why we multiply the probability of accident with the portion of insured drivers