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An electric bulb will last 190 days or m...

An electric bulb will last `190` days or more with a probability `0.7` and it will last for atmost 200 days with a probability of `0.8`. The probability that the bulb will last between `190` and `200` days is

A

`0.5`

B

`0.56`

C

`0.2`

D

`0.3`

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The correct Answer is:
A
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AAKASH SERIES-PROBABILITY-Exercise-II
  1. If three numbers are drawn at random successively without replacement ...

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  2. In a class there are 10 men and 20 women. Out of them half the number ...

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  3. An electric bulb will last 190 days or more with a probability 0.7 and...

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  4. A and B seek admission in I.I.T. The probability that A is selected is...

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  5. Two dice are rolled and given that the sum is prime. The probability o...

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  6. Two numbers are chosen at random from (1,2,3,4,5,6,7,8) at a time. The...

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  7. Two cards are drawn from pack and given that they are of different col...

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  8. 3 fair dice are rolled and given that atleast two of them show the sam...

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  9. A box contains 10 mangoes out of which 4 are spoiled. 2 mangoes are ta...

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  10. A box contains 100 tickets, numbered 1,2,….100. Two tickets are chosen...

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  11. For a biased die the probability for different faces to turn up are gi...

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  12. If A and B are any two events such that P(A)=(2)/(5) and P(AnnB)=(3)/(...

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  13. One ticket is selected at random from 50 tickets numbered 00, 01, 02, ...

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  14. E(1), E(2) are events of a sample space such that P(E(1))=(1)/(4), P((...

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  15. Two aeroplanes I and II bomb a target in succession. The probabilities...

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  16. A bag P contains 5 white marbles and 3 black marbles. Four marbles are...

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  17. Let A and B be two events such that P(barAuuB)=(1)/(6) , P(AnnB)=(1)/(...

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  18. If A and B are events such that P(AuuB)=(5)/(6), P(barA)=(1)/(4), P(B)...

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  19. If A(i=1,2,3….n) are n independent events with P(A) = (1)/(1+i) for ea...

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  20. A and B are two independent events. The probability that both A and B ...

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