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

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NEW JOYTHI PUBLICATION-PROBABILITY-SOLUTIONS TO NCERT MISCELLANEOUS EXERCISE
  1. A and B are two events such that P(A) ne 0. Find P(B|A), if i. A is...

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  2. A couple has two children. Find the probability that both children are...

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  3. Suppose that 5% of men and 0.25% of women have grey hair. A grey haire...

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

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  5. An urn contains 25 balls of which I0 balls bear a mark 'X' and remaini...

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  6. In a hurdle race a player has to cross 10 hurdles . The probability th...

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  7. A die is thrown again and again until three sixes are obtained. Find t...

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  8. If a leap year is selected at random, what is the chance that it will ...

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

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

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  11. In a game, a man wins a rupee for a six and loses a rupee for any othe...

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  12. Suppose we have four boxes A, B, C and D containing coloured marbles a...

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

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  14. If each element of a second order determinant is either zero or one, w...

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  15. An electronic assembly consists of two sub-systems, say, A and B. From...

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  16. Bag I contains 3 red and 4 black balls and Bag II contains 4 red and 5...

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  17. If A, B are two events sqch that P( A)ne 0 and P(B|A) = 1, then

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  18. If P(A|B) gt P(A), then which of the following is correct:

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  19. If A and B are any two events such that P(A) + P(B) -P(A and B) = P(A)...

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