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Sample of 3 items is selected at random from a box containing 20 items of which 4 aredefective. find the expected number of defective items in the sample.

Sample of 3 items is selected at random from a box containing 20 items of which 4 aredefective. find the expected number of defective items in the sample.
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Sample of 3 items is selected at random from a box containing 20 items of which 4 aredefective. find the expected number of defective items in the sample.

User Mathias Vonende
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8.5k points

1 Answer

5 votes
That's 54 I think. 20x3=60-4=54
User Florin Bombeanu
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