Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 4 - Probability - 4-2 Basic Concepts of Probability - Basic Skills and Concepts - Page 145: 11

Answer

Unlikely, unusual.

Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$. The probability of having a girl is $\frac{1}{2}$, therefore in 400 births, the number of girls should be approximately 200. Of course, there are many opportunities around 200, therefore it is unlikely to have exactly 11 girls. Also, it is very unusual because it is quite far from 200.
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