Answer
$x=30$
Work Step by Step
According to Table IV, page 773:
If $p(z\geq z_0)=.5$ then $z_0=0$
$z_0=\frac{x-\mu}{\sigma}$
$0=\frac{x-30}{8}$
$x-30=0(8)$
$x=30$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 5 - Continuous Random Variables - Exercises 5.20 - 5.52 - Learning the Mechanics - Page 242: 5.32a
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