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Un envo de 20 piezas contiene dos defectuosas. Se seleccionan aleatoriamente dos y se prueban. Sea la variable aleatoria Y el nmero de defectos encontrados.

Un envo de 20 piezas contiene dos defectuosas. Se seleccionan aleatoriamente dos y se prueban. Sea la variable aleatoria Y el nmero de defectos encontrados. Determina la funcin de probabilidad de esta variable aleatoria. Calcula la media y la varianza de la variable aleatoria Y.

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