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Un analista de la firma de proyecto S&M quiere estrimar el nmero medio de las horas de entrenamiento para los integrantes de un nuevo proyecto,

Un analista de la firma de proyecto S&M quiere estrimar el nmero medio de las horas de entrenamiento para los integrantes de un nuevo proyecto, con un factor de error (+ o - ) 3 horas y con un 90% de confiabilidad. La desviacin estndar es de 20. Cul es el tamao mnimo para la muestra

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