6.46 The life of a street bulb follows an exponentialdistribution, with an average life ß = 3 years. Thebulbs are replaced whenever they fail. Out of the 1000street bulbs installed in a city, what is the probabil-ity that at most 250 of them will need to be replacedduring the first year?

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Answered: 6.46 The life of a street bulb follows…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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6.46 The life of a street bulb follows an exponential distribution, with an average life ß = 3 years. The bulbs are replaced whenever they fail. Out of the 1000 street bulbs installed in a city, what is the probabil- ity that at most 250 of them will need to be replaced during the first year?