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 - 3-2 Measures of Center - Basic Skills and Concepts: 17

Answer

The mean is -14.25, mode: -32, the median is -16.5, the midrange is -10.5.

Work Step by Step

The mean can be counted by summing all the data and dividing it by the number of data: $\frac{-15-18-32-21-9-32+11+2}{8}=-14.25$, the mean is -14.25. The mode is the data occuring the most times, which here is -32 appearing twice. The median is the average of the 1 or 2 (here 2) middle data: (-15-18)/2=-16.5, the median is -12. The midrange is the average of the highest and the lowest data: (-32+11)/2=-10.5, the midrange is -10.5. American Airlines' performance is really good because most of their flights seem to arrive early.
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