Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 3 - Section 3.1 - Measures of Center for Ungrouped Data - Exercises - Page 89: 3.22

Answer

148.89

Work Step by Step

Combined mean = x ̅ = (n_1 x ̅_1+n_2 x ̅_2)/(n_1+n_2 ) = ((10×140)+(8×160))/(10+8) = 148.89
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