Answer
$P(X \geq 1000) = 0.9929$
Work Step by Step
We need to find the z value:
$z = \frac{1000 - 1247.36}{100.96} = -2.45$
$P(X \geq 1000) = P(z \geq -2.45) = 1 - P(z \geq 2.45) = 1 - 0.0071 = 0.9929$
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 7 - Section 7.3 - Assess Your Understanding - Applying the Concepts - Page 386: 9d
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