Essentials of Statistics (5th Edition)

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

Chapter 4 - Probability - 4-2 Basic Concepts of Probability - Page 145: 22

Answer

$0.09$

Work Step by Step

We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$. Therefore $probability=\frac{90}{1000}=0.09$. This result is still high considering the tested person didn't use drugs.
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