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 147: 40



Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$. Totally there are $2^{4}=16$ opportunities because every kid it can be either a boy or a girl. For us there are 4 possibilities where there is 1 boy, because the only boy can be either int the first, second, third or fourth place whilst the rest are girls. Therefore $probability=\frac{4}{16}=0.25.$
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