Answer
Nominal, cannot be averaged.
Work Step by Step
The flight numbers are just labels, they do not have a quantitative meaning, therefore they cannot be averaged.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 1 - Introduction to Statistics - 1-3 Types of Data - Basic Skills and Concepts - Page 22: 30
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