Answer
$\frac{13}{20}$
Work Step by Step
The total number of outcomes in this sample: $8+11+14+7=40$, the number of outcomes satisfying the requirements in this sample: $40-14=26$, thus the probability: $\frac{26}{40}=\frac{13}{20}$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 11 - Counting Methods and Probability Theory - 11.6 Events Involving Not and Or; Odds - Exercise Set 11.6 - Page 735: 36
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