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A lot of 20 bulbs contain 4 defective ones. One bulb is drawn

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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 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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Camila Discussed

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 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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Text solutionVerified

P (

Defective bulb

) = \frac{Defective Bulbs}{Total Bulbs} = \frac{4}{20} = \frac{1}{5}

ii) Since one bulb is already drawn, the number of bulbs remaining is

19.

Number of non defective bulbs is

15

as one bulb is picked.

P (

Non-defective

) = \frac{15}{19} .

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Question Text	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 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 ?
Answer Type	Text solution:1
Upvotes	150

Text solutionVerified

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