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26-06-2022
Mathematics

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a bag contains 4 white marbles , 7 red marbles , and 5 black marbles. you randomly select 3 marbles from the bag. without replacement.the random variable represents the number of black marbles

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26-06-2022

That variable from the number of black marble divide by all marble.
5/4+7+5 = 0.3125

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