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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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Problem 1. The Metropolis police station calls Superman an average of 3 times per hour
to ask for his help. The probability that the station calls Superman in a time interval is
dependent only on the length of the time interval and, furthermore, is independent of whether
or not the department called Superman on any previous time interval. Superman goes on a
date with Lois Lane and picks her up from her place at 7:00pm.
(a) What is the į robability that their date has been interrupted by 8:00pm?
(b) If the number of times he is called is independent from one hour to the next, what is
the probability that Superman and Lois can finish their 4 hour date uninterrupted?
(c) What is the probability that the date is interrupted 5 times during the first hour and
Lois decides to go back to the office and finish writing her article?
(d) What is the probability that the date is interrupted exactly 4 times during the first
hour given that it is interrupted fewer than six times in the first hour?
(e) What is the average length of time Lois waits for Superman to be called away during
the date?
Transcribed Image Text:Problem 1. The Metropolis police station calls Superman an average of 3 times per hour to ask for his help. The probability that the station calls Superman in a time interval is dependent only on the length of the time interval and, furthermore, is independent of whether or not the department called Superman on any previous time interval. Superman goes on a date with Lois Lane and picks her up from her place at 7:00pm. (a) What is the į robability that their date has been interrupted by 8:00pm? (b) If the number of times he is called is independent from one hour to the next, what is the probability that Superman and Lois can finish their 4 hour date uninterrupted? (c) What is the probability that the date is interrupted 5 times during the first hour and Lois decides to go back to the office and finish writing her article? (d) What is the probability that the date is interrupted exactly 4 times during the first hour given that it is interrupted fewer than six times in the first hour? (e) What is the average length of time Lois waits for Superman to be called away during the date?
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