A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?
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Question

A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?

Accepted Answer

Total bulbs = 20. Defective bulbs = 4. Probability of drawing a defective bulb = 4/20 = 1/5.

Probability