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Case-the longevity of a light bulb is exponential

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Reference no: EM131643739

Question: Suppose that the longevity of a light bulb is exponential with a mean lifetime of eight years. If a bulb has already lasted 12 years, find the probability that it will last a total of over 19 years.

2. In a small city, the number of automobile accidents occur with a Poisson distribution at an average of three per week.

a. Calculate the probability that there are at most 2 accidents occur in any given week.

b. What is the probability that there is at least two weeks between any 2 accidents?

Reference no: EM131643739

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