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Find the mean and variance of the number of ink jet printers

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A computer store has 75 printers of which 20 are laser printers and 55 are ink jet printers. If a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.

Mean = 7.3, Variance = 2.0

Mean = 7.3, Variance = 1.4

Mean = 2.7, Variance = 2.0

Mean = 2.7, Variance = 1.4

Reference no: EM132854708

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