Answer
$500$
Work Step by Step
$\text{z-score}=\frac{\text{data item-mean}}{\text{standard deviation}}$.
Hence $\text{data item}=\text{z-score}\cdot{\text{standard deviation}}+\text{mean}$
Hence here the data item: $2\cdot50+400=500$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 12 - Statistics - 12.4 The Normal Distribution - Exercise Set 12.4 - Page 814: 59
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