Answer
$0.25$
Work Step by Step
We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, therefore $P(two \ girls| fraternal \ twins)=\frac{5}{5+5+5+5}=0.25$
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 4 - Probability - 4-5 Multiplication Rule: Complements and Conditional Probability - Basic Skills and Concepts - Page 174: 28
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