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A local street contains 7 street lights. The probability that any one street light does not work is 0.30. What is the probability that at least one does not work?Question 2Answera.0.9563b.0.9998c.0.9176d.0.0002e.0.0824

Question

A local street contains 7 street lights. The probability that any one street light does not work is 0.30. What is the probability that at least one does not work?Question 2Answera.0.9563b.0.9998c.0.9176d.0.0002e.0.0824

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Solution

Para resolver este problema, primero determinamos la probabilidad de que todas las luces funcionen. Luego, usamos esta probabilidad para encontrar la probabilidad de que al menos una luz no funcione.

  1. La probabilidad de que una luz funcione es 10.30=0.701 - 0.30 = 0.70.

  2. La probabilidad de que todas las 7 luces funcionen es 0.7070.70^7.

    0.7070.0823543 0.70^7 \approx 0.0823543

  3. La probabilidad de que al menos una luz no funcione es el complemento de la probabilidad de que todas las luces funcionen.

    P(al menos una no funciona)=1P(todas funcionan) P(\text{al menos una no funciona}) = 1 - P(\text{todas funcionan})

    P(al menos una no funciona)=10.08235430.9176457 P(\text{al menos una no funciona}) = 1 - 0.0823543 \approx 0.9176457

Por lo tanto, la probabilidad de que al menos una luz no funcione es aproximadamente 0.9176.

La respuesta correcta es:

c. 0.9176

This problem has been solved

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