Answer
$94.52\%$
Work Step by Step
$\text{z-score}=\frac{\text{data item-mean}}{\text{standard deviation}}$.
Hence $z=\frac{221-200}{15}=1.6$.
Then the answer, using the table is: $94.52\%$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 12 - Statistics - Chapter Summary, Review, and Test - Review Exercises - Page 836: 52
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