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Un articulo reciente informa que el costo promedio de la mano de obra de reparar una bonba de agua es $90 con un desviacion estandard

Un articulo reciente informa que el costo promedio de la mano de obra de reparar una bonba de agua es $90 con un desviacion estandard de $22. La empresa ponce plumbing reapiring realizo una reparacion un bomba por lo que cobro $75. Determine cual la probabilidad de que la reparacion de una bomba sea menor o igual a $75 Calcule el valor de z

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