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.
Essentials of Statistics (5th Edition)
by Triola, Mario F.
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
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