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(i) A lot of 20 bulbs contain 4 defec...

(i) 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? (ii) Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at ra

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The correct Answer is:
(1) `P(A) = 4/20 = 1/5`
(2) `P(B) = 15/19`
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KUMAR PRAKASHAN-PROBABILITY -EXERCISE 15.1
  1. A bag contains lemon flavoured candies only. Malini takes out one c...

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  2. It is given that in a group of 3 students, the probability of 2 stu...

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  3. A bag contains 3 red balls and 5 black balls. A ball is drawn at ra...

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  4. A box contains 5 red marbles, 8 white marbles and 4 green marbles. One...

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  5. A piggy bank contains hundred 50p coins, fifty Rs. 1 coins, twenty ? ...

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  6. Gopi buys a fish from a shop for his aquarium. The shopkeeper takes o...

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  7. A game of chance consists of spinning an arrow which comes to rest ...

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  8. A die is thrown once. Find the probability of getting (i) a prime numb...

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  9. One card is drawn from a well-shuffled deck of 52 cards. Find the prob...

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  10. Five cardsthe ten, jack, queen, king and ace of diamonds, are well ...

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  11. 12 defective pens are accidentally mixed with 132 good ones. It is ...

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  12. (i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn a...

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  13. A box contains 90 discs which are numbered from 1 to 90. If one disc ...

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  14. A child has a die whose six faces show the letters as given below: ...

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  15. Suppose you drop a die at random on the rectangular region shown in...

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  16. A lot consists of 144 ball pens of which 20 are defective and the o...

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  17. (1) Complete the following table : (2) A student argues that 'the...

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  18. A game consists of tossing a one rupee coin 3 times and noting its ...

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  19. A die is thrown twice. What is the probability that (i) 5 will not...

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  20. Which of the following arguments are correct and which are not corr...

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