Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0-32191-121-0
ISBN 13: 978-0-32191-121-6

Chapter 2 - Descriptive Statistics - Section 2.1 Frequency Distributions and Their Graphs - Exercises: 17

Answer

$82.1$

Work Step by Step

$\frac{15}{100} \times (78+72+86+91+87) + \frac{25}{100} \times 80 = 82.1$ We add up the scores of the first five tests and weigh that by 15%, then weigh the score of the final test by 25% to attain our weighted mean (average).
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