In a recent report, Joe's, a Memphis-style barbecue chain, states that 11% of its customers order for delivery. A random sample of 6 Joe's customers is chosen. Find the probability that at most 1 of them order for delivery.Do not round your intermediate computations, and round your answer to three decimal places.
Question
In a recent report, Joe's, a Memphis-style barbecue chain, states that 11% of its customers order for delivery. A random sample of 6 Joe's customers is chosen. Find the probability that at most 1 of them order for delivery.Do not round your intermediate computations, and round your answer to three decimal places.
Solution
Para resolver este problema, utilizaremos la distribución binomial. La fórmula de la distribución binomial es:
donde:
- es el número de ensayos (en este caso, 6).
- es el número de éxitos deseados (en este caso, 0 o 1).
- es la probabilidad de éxito en un solo ensayo (en este caso, 0.11).
- es el coeficiente binomial, que se calcula como .
Primero, calculamos la probabilidad de que exactamente 0 clientes pidan entrega:
Luego, calculamos la probabilidad de que exactamente 1 cliente pida entrega:
Finalmente, sumamos las probabilidades de que 0 o 1 clientes pidan entrega para encontrar la probabilidad de que a lo sumo 1 cliente pida entrega:
[ P(X \leq 1) = P
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