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A packet contains two types of resistors, 30 resistors of resistance 470 and 20 resistors of resistance 5602. Let X be the numbers of 4702

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A packet contains two types of resistors, 30 resistors of resistance 470 and 20 resistors of resistance 5602. Let X be the numbers of 4702 resistors out of 10 resistors drawn from the packet at random WITHOUT REPLACEMENT. Find the mean and variance of X. [3]

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