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

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section: Chapter Questions
Problem 27T
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Suppose that the longevity X of a light bulb is exponential with a mean lıfetime of
eight years. If a bulb has already lasted more than 12 years, find the probability that
it will last a total of over 19 years.
Transcribed Image Text:Suppose that the longevity X of a light bulb is exponential with a mean lıfetime of eight years. If a bulb has already lasted more than 12 years, find the probability that it will last a total of over 19 years.
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