An actuary studied the likelihood of accidents in a one-year period among a large group of insured drivers. The following table gives the results. Age Group Percent of Drivers Probability of 0 Accidents Probability of 1 Accident 16-20 21-30 31-50 51-70 71+ 15% 25% 35% 20% 5% 0.20 0.35 0.60 0.67 0.50 0.25 0.40 0.30 0.23 0.35 Suppose that a randomly selected insured driver in the studied group had at least 2 accidents in the past year. Calculate the probability that the insured driver is in the age group 21-30.