Answer
56
Work Step by Step
σ = 16.06 billion, σ_${\bar{x}\ }$ = 2.15 billion
$σ_{\bar{x}\ }$ = $\frac{σ}{\sqrt n}$
2.15 billion = $\frac{16.06}{\sqrt n}$
n= 55.7974 $\approx$ 56
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 7 - Section 7.2 - Mean and Standard Deviation of x - Exercises - Page 283: 7.16
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