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: 18



Work Step by Step

$\frac{20}{100} \times (96+85+91) + \frac{40}{100} \times 86 = 88.8$ We add up the scores of the first three tests and weigh that by 20%, then weigh the score of the final test by 40% to attain our answer.
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