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a) The average lifetime of a 56 Mobile telephone is 7 years. Suppose that the lifetime follows an exponential distribution. (Hint: use the relationship between

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a) The average lifetime of a 56 Mobile telephone is 7 years. Suppose that the lifetime follows an exponential distribution. (Hint: use the relationship between the Exponential and Poisson distributions) (i) Find the probability that a particular SG Mobile telephone lasts for fewer than 4 years. Complete the following to compute the probability. 120(04):]: m) it

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