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7. A batch of 100 computer chips contains 10 defective chips. Five chips are chosen at random, without replacement. Find each of the following:

7. A batch of 100 computer chips contains 10 defective chips. Five chips are chosen at random, without replacement. Find each of the following: 1. The probability density function of the number of defective chips in the sample. 2. The mean and variance of the number of defective chips in the sample 3. The probability that the sample contains at least one defective chip

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