A lot of 60 bulbs contain 12 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb drawn in first attempt is defective and is not replaced. Now, one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

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A lot of 60 bulbs contain 12 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb drawn in first attempt is defective and is not replaced. Now, one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

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35, 4759

15, 4759

15, 4859

35, 4859

answer is C.

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Detailed Solution

As it is given that a lot of 60 bulbs contain 12 defective ones. One bulb is drawn at random from the lot.
Let us find the probability that this bulb is defective.
Total number of outcomes is = 60
Number of defective bulbs is 12 .
So, number of favourable outcomes = 12
The formula of the probability of an event is the number of favourable outcomes divided by the total number of outcomes.