Answer
Yes, it would be unusual.
Work Step by Step
According to item (c), 8.312 hours is the cutoff for the top 5% of all talk times. Since $9~hours\gt8.312~hours$
$P(9)\lt0.05$. So, it is an unusual event.
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 7 - Review - Test - Page 395: 6d
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