Answer
0.0465
Work Step by Step
To calculate $P(x̄ \leq 260)$, we need to find the z-score:
$z = \frac{x̄ - μ_{x̄}}{σ_{x̄}}$
$= \frac{260-266}{3.578}$ = -1.68
$P(z \leq -1.68 ) = 0.0465$, hence:
$P(x̄ \leq 260) = 0.0465$
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 411: 19c
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