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Una firma de investigacin de mercados realiza encuestas telefnicas con una tasa histrica de respuesta de 40%. Cul es la probabilidad de que en una

Una firma de investigacin de mercados realiza encuestas telefnicas con una tasa histrica de respuesta de 40%. Cul es la probabilidad de que en una nueva muestra de 400 nmeros telefnicos, por lo menos 150 personas cooperen y respondan las preguntas? En otras palabras, cul es la probabilidad de que la proporcin muestral sea por lo menos 150/400 = 0.375?

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