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Math Help - How to use Binomial Distribution for this problem?

  1. #1
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    How to use Binomial Distribution for this problem?

    Please, help me to solve the problem(it's from Binomial Distribution):
    A department-store promotion involves scratching 4 boxes on a card to reveal randomly printed letters from A to F. The discount is 10% for each A revealed, 5% for each B revealed, and 1% for the other 4 letters. What is the expected discount for this promotion?
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  2. #2
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    Quote Originally Posted by Romanka View Post
    Please, help me to solve the problem(it's from Binomial Distribution):
    A department-store promotion involves scratching 4 boxes on a card to reveal randomly printed letters from A to F. The discount is 10% for each A revealed, 5% for each B revealed, and 1% for the other 4 letters. What is the expected discount for this promotion?
    The expected number of A's is (4)(1/6) = 2/3.
    The expected number of B's is (4)(1/6) = 2/3.
    The expected number of other letters is (4)(4/6) = 8/3.

    Therefore the expected % discount is (2/3)(10) + (2/3)(5) + (8/3)(1) = ....
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  3. #3
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    Thank you so much!
    I just don't understand how to use Binomial Distribution there
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