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? Suppose the bulb drawn in previous case 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?
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6
probability in first case is 1/5 and fir the naxt situation,it is 15/19
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4
(1 )
= 1/5
(2)
= 15/19
= 1/5
(2)
= 15/19
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