Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-4 Measures of Relative Standing and Boxplots - Basic Skills and Concepts - Page 125: 25


247.5 sec.

Work Step by Step

$P_{50}$ is the value where 50 % of the values are smaller than $P_{50}$. 50% of the data here is: $24\cdot0.5=12$, therefore $P_{50}$ is the average of the 12th and the 13th value, which is (245+250)/2=247.5 sec..
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