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A card is drawn and replaced in an ordinary pack of 52 cards. How many  times must a card be drawn so that there is at least an even chance of drawing a heart.

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RD SHARMA ENGLISH-BINOMIAL DISTRIBUTION -All Questions
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  10. In an examination, 20 questions of true-false type are asked. Suppo...

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  13. A person buys a lottery ticket in 50 lotteries, in each of which his ...

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  14. The probability of a shooter hitting a target is 3/4 . How many minimu...

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

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

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

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

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

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

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