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Una variable aleatoria normal X tiene una media y desviacin estndar desconocidas. La probabilidad de que X exceda de 4 es 0.9772 y la probabilidad

Una variable aleatoria normal X tiene una media y desviacin estndar desconocidas. La probabilidad de que X exceda de 4 es 0.9772 y la probabilidad de que X exceda de 5 es 0.9332. Halle la media y desviacin estandar.

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