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Math Help - probability(1)

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    probability(1)

    (1) fifteen coupons are numbered 1,2,3,.......,15.Seven Coupons are selected at random with replacement. Then find the probability no. appearing on a selected coupons is 9
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    Quote Originally Posted by jacks View Post
    (1) fifteen coupons are numbered 1,2,3,.......,15.Seven Coupons are selected at random with replacement. Then find the probability no. appearing on a selected coupons is 9
    Then find the probability no. appearing on a selected coupons is 9
    How many selected coupons?

    What you have here is a binomial distribution with n = 7 and p = 1/15.

    If you need more help, please clarify the question, show what you've tried and say where you are stuck.
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    actually I have not getting any idea in that question.

    Thanks.
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