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 - Page 92: 17


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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.