Answer
$P(E~or~F)=0.75$
Work Step by Step
Using the General Addition Rule (page 273):
$P(E~or~F)=P(E)+P(F)-P(E~and~F)=0.7+0.2-0.15=0.75$
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 5 - Section 5.6 - Assess Your Understanding - Vocabulary and Skill Building - Page 311: 9
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