What is the probability that there will be exactly 1 item


The items produced by a certain machine may be classified in 4 grades, A, E, C, and D. It is known that these items are produced in the following proportions:

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What is the probability that there will be exactly 1 item of each grade in a sample of 4 items, selected at random from the output of the machine?

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Basic Statistics: What is the probability that there will be exactly 1 item
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