Problem 8-12 The time between accidents at a congested intersection has an exponential distribution with unknown parameter , which may assume values of (1) 2/hour, (2) 3/hour, or (3) 4/hour. Complete the following for each of these levels. (a) Determine the probability that an accident will happen within 1.5 hours. lambda=2/hour probability= lambda-3/hour probability= lambda-4/hour probability= (b) Find the expected time between accidents. lambda-2/hour expectation= lambda=3/hour expectation= lambda=4/hour expectation= (c) Find the variance in time between accidents. lambda=2/hour variance= lambda-3/hour variance= lambda=4/hour variance=

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