Testimony A cab company was involved in a hit-and-run acci dent at night. Two cab companies, the Green and the Blue, operate in the city.

You are given the following data: 85 percent of the cabs in the city are Green, 15 percent are Blue. A witness identified the cab involved in the accident as Blue. The court tested the reliability of the witness under the same circum stances that existed on the night of the accident and concluded that the wit ness correctly identified each one of the two colors 80 percent of the time and failed 20 percent of the time. What is the probability that the cab involved in the accident was Blue rather than Green?