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Question 17 (i)
(i) 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?
(i) 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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Solution
(i) Total number of outcomes = 20
Number of favourable outcomes = 4
Hence P (getting a defective bulb)
=420=15
Number of favourable outcomes = 4
Hence P (getting a defective bulb)
=420=15
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