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in a hospital ward there are 16 patients, 4 of whom have aids. a doctor is assigned to 6 of these patients at random. what

in a hospital ward there are 16 patients, 4 of whom have aids. a doctor is assigned to 6 of these patients at random. what is the VARIANCE if he gets 2 of the aids patients?

**My answer is .8889, is that right?

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