Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 3 - Section 3.3 - Assess Your Understanding - Applying the Concepts - Page 163: 10

Answer

87.15%

Work Step by Step

$x̅_w=\frac{Σw_ix_i}{Σw_i}=\frac{5\times100+10\times93+60\times86+25\times85}{5+10+60+25}=\frac{8715}{100}=87.15$
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