What is the posterior probability that the taxi at fault was blue?
What is the posterior probability that the taxi at fault was blue? Multiplying . 15 by . 8 gives us . 12, 12%, which is the posterior probability of the accident involving a blue cab that was correctly identified as blue, a true positive.
What color are most taxis?
While there are some exceptions in certain places (like London, where taxis are black) the most common taxi color is yellow in most places worldwide. In some cities and countries where taxis aren't painted yellow, the taxi sign placed on top of the roof is usually yellow.