During a certain part of the day, the time between arrivals of automobiles at the tollgate on a turnpike is an exponential random variable with an expected value of 20 seconds. Find the probability that the time between successive arrivals is more than 60 seconds and also find the probability that the time between successive arrivals is greater than 10 seconds and less than 30 seconds.

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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During a certain part of the day, the time between arrivals of automobiles at the tollgate on a turnpike is an exponential random variable with an expected value of 20 seconds. Find the probability that the time between successive arrivals is more than 60 seconds and also find the probability that the time between successive arrivals is greater than 10 seconds and less than 30 seconds.

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