Mathematics
A box of 160 electric bulbs contains 12 defective bulbs. One bulb is taken out at random from the box. What is the probability that the bulb drawn is:
(i) defective?
(ii) non-defective?
Probability
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Answer
Given,
Total number of bulbs = 160
Number of defective bulbs = 12
Number of non defective bulbs = 160 - 12 = 148
(i) Let A be the event of taking out defective bulb , then
∴ The number of favourable outcomes to the event A = 12.
∴ P(A) =
Hence, the probability of taking out a defective bulb is
(ii) Let B be the event of taking out non-defective bulb , then
∴ The number of favourable outcomes to the event B = 148.
∴ P(B) =
Hence, the probability of taking out a non-defective bulb is
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