Answer
$0$ corresponds to the case where no line is in use, and $50$ corresponds to the case where all lines are in use.
Work Step by Step
The possible values are all integers from $0$ to $50$
Applied Statistics and Probability for Engineers, 6th Edition
by Montgomery, Douglas C.; Runger, George C.
Published by
Wiley
ISBN 10:
1118539710
ISBN 13:
978-1-11853-971-2
Chapter 3 - Section 3-1 - Discrete Random Variables - Exercises - Page 67: 3-2
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