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How many times must a man toss a fair co...

How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

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CENGAGE PUBLICATION-PROBABILITY-All Questions
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  2. Aa n dB play a series of games which cannot be drawn and p , q are ...

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  3. How many times must a man toss a fair coin so that the probability of ...

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  4. Suppose that 90% of people are right-handed. What is the probability t...

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  5. A die is thrown 7 times. What is the chance that an odd number turns...

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  6. If P(A)=0. 8 ,P(B)=0. 5 ,a n dP(B//A)=0. 4 , find (i) P(AnnB) (ii)P(A/...

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  7. Two dice are thrown. What is the probability that the sum of the nu...

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  8. What is the probability of guessing correctly at least 8 out of 10 ...

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  9. An experiment succeeds twice as often as it fails. Find the probabilit...

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  10. Assume that the chances of a patient having a heart attack is 40%. It ...

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  11. The chance of defective screws in three boxes A ,B ,Ca r e1//5,1//6,1/...

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  12. The probability that a particular day in the month of July is a rai...

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  13. A bag contains W white and 3 black balls. Balls are drawn one by one ...

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  14. Let A and B be two independent events. The probability of their sim...

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  15. The odds against a certain event are 5 to 2, and the odds in favour of...

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  16. If four whole numbers taken at random are multiplied together, then fi...

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  17. A rifleman is firing at a distance target and hence has only 10% ch...

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  18. One of 10 keys open the door. If we try the keys one after another, ...

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  19. An electrical system has open-closed switches S1, S2 and S3 as shown i...

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  20. A bag contains 3 white, 3 black and 2 red balls. One by one, three ...

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