Answer:
P = 0.933
They are very likely to be in a car crash next year so they should be concerned
Step-by-step explanation:
If 420 out of 450 randomly selected drivers between 16-18 age bracket were in a car crash last year. Then the probability that he or she will be in a car crash during the next year is 420 / 450 = 0.933. This probability is larger than 0.05 so they will be very 'likely' to get involved in a car crash next year. This is high enough to concern those who are in 16-18 age bracket.