Points are selected, one by one, from an exponential distribution with parameter λ = 2, until we get one point (say X) that exceeds 1. (a) Find the expected number of points below 1 that will be selected before X is obtained. (b) When a point that exceeds 1 is finally reached, what is the probability that this point actually exceeds 1.5?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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Points are selected, one by one, from an exponential distribution with parameter λ = 2, until we get one point (say X) that exceeds 1. (a) Find the expected number of points below 1 that will be selected before X is obtained. (b) When a point that exceeds 1 is finally reached, what is the probability that this point actually exceeds 1.5?
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