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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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`=(15)/(19)`
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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 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) in not defective and not replaced. Now, bulb is drawn at random from the rest. What is the probability that this bulb is not defective ?

A lot of 25 bulbs contain 5 defective ones. One bulb is drawn at random from the lot. What is the probability that the bulb is good.

A lot of 60 bulbs contain 12 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 first attempt is 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?

A lot of 20 eggs contains 5 defective eggs . One egg is drawn at random from the lot . What is the probability that (i) This egg is defective ? (ii) This egg is not defective ?

Suppose the bulb drawn in ( is is not defective and not replaced.Now bulb is drawn at random from the rest.What is the probability that this bulb is not defective?

It is known that a box of 200 electric bulbs contains 16 defective bulbs. One bulb is taken out at random from the box. What is the probability that the bulb drawn is (i) defective, (ii) non-defective?

It is known that a box of 100 electric bulbs contains 8 defective bulbs. One bulb is taken out at random from the box. What is the probability that the bulb drawn is (i) defective? (ii) non -defective?

Out of 250 bulbs in a box, 35 bulbs are defective. One bulb is taken out at random from the box. Find the probability that the drawn bulb is not defective.

OSWAL PUBLICATION-PROBABILITY-NCERT CORNER ( Exercise-15.1)
  1. One card is drawn from a well-shuffled deck of 52 cards. Find the prob...

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

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

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  4. Five cards - the ten, jack, queen, king and ace of diamonds, are well-...

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  5. Five cards the ten, jack, queen king and ace of diamonds, are well...

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  6. 12 defective pens are accidentally mixed with 132 good ones. It is ...

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  7. A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at rand...

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

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

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

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

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

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

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

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  15. Refer to Example 13. (i) Complete the following table (ii) A student ...

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  16. A game consists of tossing a one-rupee coin three times and noting its...

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  17. A die is thrown twice. Find the probability that: 5 will not come up...

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  18. A die is thrown twice. Find the probability that: 5 will come up at ...

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  19. Examine, If two coins are tossed at the same time, there are 3 poss...

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  20. State true or false and justify “If a die is thrown, there are two ...

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