Elementary Statistics: Picturing the World (6th Edition)

Published by Pearson
ISBN 10: 0321911210
ISBN 13: 978-0-32191-121-6

Chapter 2 - Descriptive Statistics - Review Exercises - Page 117: 15

Answer

Weighted mean = 82.1

Work Step by Step

Weighted mean = (78 72 86 91 87) x 0.15 + 90 x 0.25
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