Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 3 - Data Description - 3-1 Measures of Central Tendency - Exercises 3-1 - Page 125: 25

Answer

$35.4\%$

Work Step by Step

Find the weighted mean of a variable X by multiplying each value by its corresponding weight and dividing the sum of the products by the sum of the weights. mean percentage=$\frac{1000\times0.4+3000\times0.3+800\times0.5}{1000+3000+800}=0.354=35.4\%$
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