Answer
0.2514
Work Step by Step
Let's find the z-score for 90:
$z=\frac{X-μ}{σ}=\frac{90-100}{15}=-0.67$
According to Table V, the area to the left (will score below 90) of the standard normal curve for a z-score equal to -0.67 is 0.2514.
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: 11b
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