Answer
$0.868$
Work Step by Step
In total he arrived on time $217$ times, thus the probability is: $\frac{217}{250}=0.868$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Chapter Review - Page 735: 19
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