Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 4 - Probability - 4-5 Multiplication Rule: Complements and Conditional Probability - Page 173: 23

Answer

$0.32836$

Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, therefore $P(Drugs | Positive)=\frac{44}{44+90}=\frac{44}{134}=0.32836$
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