The time between people arriving to a softball game in a window of time is distributed as an exponential random variable with mean 0.2 minutes. a. What is the expected number of people arriving per hour? b. What is the probability that a ticket-checker has to wait at least 2 minutes between two consecutive arrivals? c. A ticket-checker has waited for 3 minutes without an arrival. What is the probability that they have to wait at least 2 more minutes?

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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The time between people arriving to a
softball game in a
window of time is distributed as an exponential random variable
with mean 0.2 minutes.
a. What is the expected number of people arriving per hour?
b. What is the probability that a ticket-checker has to wait at least
2 minutes between two consecutive arrivals?
c. A ticket-checker has waited for 3 minutes without an arrival.
What is the probability that they have to wait at least 2 more
minutes?
Transcribed Image Text:The time between people arriving to a softball game in a window of time is distributed as an exponential random variable with mean 0.2 minutes. a. What is the expected number of people arriving per hour? b. What is the probability that a ticket-checker has to wait at least 2 minutes between two consecutive arrivals? c. A ticket-checker has waited for 3 minutes without an arrival. What is the probability that they have to wait at least 2 more minutes?
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