1 Si el 20 de los residentes de una ciudad de Estados Unid.pdf

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1) Si el 20% de los residentes de una ciudad de Estados Unidos prefieren un telfono blanco a cualquier otro color disponible, cul es la probabilidad de que entre los prximos 1000 telfonos instalados en esa ciudad (a) entre 170 y 185 inclusive sean blancos? (b) al menos 210 pero no ms de 225 sern blancos? 2) El nivel de colesterol srico X en nios de 14 aos tiene aproximadamente una distribucin normal con media 170 y desviacin estndar 30. (a) Calcule la probabilidad de que el nivel de colesterol srico de un nio de 14 aos elegido al azar exceda 230 (b) En una escuela secundaria hay 300 nios de 14 aos. Encuentre la probabilidad de que al menos 8 nios tengan un nivel de colesterol srico superior a 230. 3) Suponga que la vida til, en aos, de la batera de un audfono es una variable aleatoria que tiene una distribucin de Weibull con = 2 y = 1/2. ) (a) Cunto tiempo se puede esperar que dure tal batera? (b) Cul es la probabilidad de que dicha batera est funcionando despus de 2 aos?.

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