Answer
0.1894
Work Step by Step
To calculate P(x̄ < 40), we need to find the z-score:
$z = \frac{x̄ - μ}{σ}$
$= \frac{40-43.7}{4.2}$ = -0.88
P(z < -0.88) = 0.1894, hence:
P(x̄ < 40) = 0.1894
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: 20a
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