Tay-Sachs. Exercises 6.1 and 6.3 considered the random number of Tay-Sachs cases in three pregnancies from a

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Tay-Sachs. Exercises 6.1 and 6.3 considered the random number of Tay-Sachs cases in three pregnancies from a carrier couple (X ~ b(3, 0.25)). What is the expected value and variance of this random variable?

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