Answer
Use the purple area.
Work Step by Step
In order to find the probability that a student has both a sister and a brother, divide the intersection of the sets (the purple area on the Venn Diagram) by the overall number of students.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - Investigating Algebra Activity - 10.4 Find Probabilities Using Venn Diagrams - Draw Conclusions - Page 706: 1c
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