Answer
$\frac{1}{3}$
Work Step by Step
The probability that the friend is at least 20 minutes late is:
(it means that the friend arrived between 20 and 30 minutes late)
$\frac{1}{30} \times (30 - 20) = \frac{1}{30} \times 10 = \frac{1}{3}$
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 - Section 7.1 - Assess Your Understanding - Vocabulary and Skill Building - Page 367: 15
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