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
Introductory Statistics 9th Edition
by Mann, Prem S.
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
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