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The time until failure of an electronic device has an exponential distribution with mean 15 months. If a random sample of five such devices are tested, what is the probability that the first failure among the five devices occurs a after 9 months? b before 12 months?

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Answer:

The probability that the first failure occurs among the five devices is given by

(a) 9 months =[tex]\frac{9}{15} or =0.6[/tex]

(b) 12 months=[tex]\frac{12}{15} or = 0.8[/tex]

Step-by-step explanation:

probability is given as the; number of required outcome/ total number of possible outcome.

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