Answer
$\frac{n(V\cap I)}{n(I)}=0.375$
37.5% of the Internet stocks had their value increased.
Work Step by Step
$\frac{n(V\cap I)}{n(I)}=\frac{15}{40}=\frac{3}{8}=0.375$
This is the proportion of the Internet stocks whose value increased.
Finite Math and Applied Calculus (6th Edition)
by Waner, Stefan; Costenoble, Steven
Published by
Brooks Cole
ISBN 10:
1133607705
ISBN 13:
978-1-13360-770-0
Chapter 7 - Section 7.1 - Sample Spaces and Events - Exercises - Page 458: 63
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