Answer
$P(X\leq23)=0.0808$
Work Step by Step
Let's find the z-score for 23:
$z=\frac{X-μ}{σ}=\frac{23-30}{5}=-1.4$
According to Table V, the area of the standard normal curve to the left of the z-score equal to -1.4 is 0.0808.
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 - Review - Review Exercises - Page 394: 8
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