Box 1 contains 1000 lightbulbs of which 10% are defective
Box 1 contains 1000 lightbulbs of which 10% are defective. Box 2 contains
2000 lightbulbs of which 5% are defective.
Suppose a box is given to you at random and you randomly select a lightbulb from the box. If that lightbulb is defective, what is the probability you chose Box 1?