28. Need help with B please round 3 decimal places

According to a study of 100 drivers in a metropolitan area, whose cars were equipped with cameras with sensors, the distractions and th caused by these distractions are as follows. Distraction A B C D E F H Driving Incidents 662 378 195 163 132 134 114 114 87 where A = Wireless device (cell phone, PDA) B = Passenger C = Something inside car D = Vehicle E = Personal hygiene F = Eating G = Something outside car H = Talking/singing 1 = Other If an incident caused by a distraction is picked at random, what is the probability that it was caused by each of the following? (Round your (a) the use of a wireless device 0.335 (b) something other than personal hygiene or eating 0.865 X