Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 12 - Statistics - 12.5 Problem Solving with the Normal Distribution - Exercise Set 12.5 - Page 821: 44

Answer

She is approximately $62$ inches tall.

Work Step by Step

Using the table the z-score belonging to $\frac{1}{400}=0.25\%$: $z\approx-2.8$ $z=\frac{\text{data item-mean}}{\text{standard deviation}}$. Hence here: $-2.8=\frac{x-69}{2.5}=\\-2.8\cdot2.5=x-69\\-7=x-69\\x=-7+69=62$
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