Answer
$\frac{1}{20}$
Work Step by Step
Since 10 of the 200 people tested had no change in blood pressure so the probability is
$\frac{10}{200}=\frac{10\div10}{200\div10}=\frac{1}{20}$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 8 - Section 8.5 - Counting and Introduction to Probability - Exercise Set - Page 582: 33
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