20 percent of the pens produced in a factory are of red colour and 4 percent are red and defective. If one pen is picked up at random, then what is the…
20 percent of the pens produced in a factory are of red colour and 4 percent are red and defective. If one pen is picked up at random, then what is the probability of its being defective if it is red?
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Correct answer: (A) 0.2
Explanation
P(defective | red) = P(red and defective) / P(red) = 0.04 / 0.20 = 0.2.