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defon
2 years ago
15

Suppose that in a population of 1000 there are 300 defective items and 700 items that are not defective. if you are selecting tw

o items at random from this population, what is the probability they will both be defective?
Mathematics
1 answer:
natulia [17]2 years ago
4 0
This is a combinations problem.

The total number of possible 2-item combinations is (1000 choose 2)

The number of 2-defective combinations is (300 choose 2)

The probability = \frac{300 C 2}{1000 C 2} = 0.09
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