30. La Oficina de Información Energética reportó que el precio medio por galón de gasolina de grado regular es de $2.05 (Energy Information Administration, mayo de 2009). Suponga que la desviación estándar es $0.10 y que el precio al detalle (o al menudeo) por galón tiene una distribución con forma de campana. a) ¿Qué porcentaje de gasolina de grado regular se vendió entre $1.95 y $2.15 por galón? b) ¿Qué porcentaje se vendió entre $1.95 y $2.25 por galón? c) ¿Qué porcentaje de gasolina de grado regular se vendió por más de $2.25 por galón?
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7 rule) for a bell-shaped distribution. Given: Mean ($\mu$) = $2.05 Standard deviation ($\sigma$) = $0.10 The empirical rule states that for a bell-shaped distribution: - Approximately 68% of the data falls within 1 standard deviation of the mean ($\mu \pm Show more…
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