Answer
$μ_{X ̅}=20~cars$
$σ_{X ̅}=0.707~cars$
Work Step by Step
$μ_{X ̅}=μ=20$
$σ_{X ̅}=\frac{σ}{\sqrt n}=\frac{\sqrt {20}}{\sqrt {40}}=0.707$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 8 - Section 8.1 - Assess Your Understanding - Applying the Concepts - Page 412: 28b
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