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How many times must a man toss a fair coin so that the probability of having at least one head is more than 80%?

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RD SHARMA ENGLISH-BINOMIAL DISTRIBUTION -All Questions
  1. The probability of a shooter hitting a target is 3/4 . How many minimu...

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

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

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  4. A pair of dice is thrown 5 times. If getting a doublet is considered a...

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  5. From a lot of 30 bulbs which include 6 defectives, a sample of 4 bu...

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  6. Find the expectation of the number of heads in 15 tosses of a coin.

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  7. Can the mean of a binomial distribution be less than its variance?

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  8. Determine the binomial distribution whose mean is 9 and variance 6.

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  9. If the mean and variance of a binomial distribution are respectively 9...

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  10. If the sum of the mean and variance of a binomial distribution for 5 ...

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  11. Determine the binomial distribution whose mean is 20 and variance 16.

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  12. The mean of a binomial distribution is 20, and the standard deviation ...

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  13. If the probability of defective bolts is 0.1, find the mean and standa...

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  14. If on an average 9 ships out of 10 arrive safely to ports, find the me...

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  15. In eight throws of a die 5 or 6 is considered a success, find the mean...

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  16. Find the expected number of boys in a family with 8 children, assuming...

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  17. A die is thrown thrice. A success is 1 or 6 in a throw. Find the mean ...

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  18. A pair of dice is thrown 4 times. If getting a doublet is considere...

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  19. From a lot of 15 bulbs which include 5 defectives, a sample of 2 bulbs...

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  20. Three cards are drawn successively with replacement from a well shu...

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