Answer
$0.19.$
Work Step by Step
In a probability model the sum of all probabilities equals $1$.
Hence $0.03+P(\text{18-20 years old})+0.23+0.29+0.25+0.01=1\\P(\text{18-20 years old})=1-(0.03+0.23+0.29+0.25+0.01)=0.19.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 13 - Counting and Probability - Chapter Review - Chapter Test - Page 869: 14
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