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4. Durante el ao pasado el 70% de las acciones ordinarias inscritas en la bolsa nacional de valores, elevaron su valor de mercado, mientras que

4. Durante el ao pasado el 70% de las acciones ordinarias inscritas en la bolsa nacional de valores, elevaron su valor de mercado, mientras que el 30% restante permaneci sin cambios o redujo su valor de mercado. Al inicio de ao, se eligieron 10 emisiones de acciones como "especialmente recomendables". Si las 10 emisiones representan una seleccin aleatoria, cul es la probabilidad de que: a) Las 10 emisiones hayan elevado su valor de mercado. b) Al menos 8 emisiones hayan elevado su valor de mercado. c) Un mximo de 3 elevaron su valor de mercado.

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