Mathematics
A box contains 150 bulbs out of which 15 are defective. It is not possible to just look at a bulb and tell whether or not it is defective. One bulb is taken out at random from this box. Calculate the probability that the bulb taken out is :
(i) a good one
(ii) a defective one.
Probability
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Answer
Total bulbs = 150.
No. of possible outcomes = 150
(i) Good bulbs = Total bulbs - Defective bulbs
= 150 - 15 = 135.
∴ No. of favourable outcomes = 135.
P(drawing a good bulb) = .
Hence, probability of drawing a good bulb = .
(ii) No. of defective bulbs = 15.
∴ No. of favourable outcomes = 15.
P(drawing a defective bulb) = .
Hence, probability of drawing a defective bulb = .
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