Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 3 - Statistics for Describing, Exploring, and Comparing Data - 3-2 Measures of Center: 21

Answer

Mean:white drivers:73, African American drivers:74. Median:white drivers:73, African American drivers:74. The African American drivers appear to speed more because their mean and median is more.

Work Step by Step

The mean can be counted by summing all the data and dividing it by the number of data: for white drivers: $\frac{74+77+69+71+77+69+72+75+74+72}{10}=73$, for African American drivers: $\frac{79+70+71+76+76+74+71+75+74+74}{10}=74$. The median is the average of the 1 or 2 (here 2) middle data: for white drivers:(74+72)/2=73, for African American drivers:(74+74)/2=74. The African American drivers appear to speed more because their mean is more.
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