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Class 10
Mathematics
Probability
i a lot of 20 bulbs contain 4 defective ones on...

Question:
(i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?
(ii) Suppose the bulb drawn in (i) is not 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 ?

Answer:

Total no. Of bulbs = 20

Number of defective bulbs = 4

Number of good bulbs = 16

(i) Probability of getting a defective bulb = 4/20 = 1/5

(ii) If one good bulb is kept aside,

Total no. Of bulbs = 19

Number of good bulb (not defective) = 15

Probability of getting not defective bulb = 15/19

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