Question

(i) 6 defective light bulbs are accidentally mixed with 24 good one. One bulb is taken out at
random from this lot. Determine the probability that the bulb taken out is good one.
(i) Suppose the bulb drawn in (i) is defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is defective ?​

Answer 1

Answer:

i) 6/24 = 1/4

ii) Now only 23 bulbs are left and only 5 are defective

  So, the probability of getting a defective bulb now is 5/23  

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Answer 2

Answer:

(I)As 6 bulbs are mixed with 24 good one therefore total outcome is 30

P(Good bulb) = 24/30

(2) Now one bulb is removed which is bad therefore total outcome = 29 and defective bulb=5

P(Defective bulb ) = 5/29