Answer
The sample mean charge life, $X ̅$, is normally distributed with $μ_{X ̅}=90~min$ and $σ_{X ̅}=11.07~min$.
Work Step by Step
$μ_{X ̅}=μ=90$
$σ_{X ̅}=\frac{σ}{\sqrt n}=\frac{35}{\sqrt {10}}=11.07$
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 - Review - Test - Page 422: 3b
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