Answer
$0.3$ or $30\%$
Work Step by Step
First, find the total number of marbles.
50+30+20=100
The probability of choosing a red marble is
$\dfrac{\text{number of red marbles}}{\text{total number of marbles}}$=$\dfrac{30}{100}=0.3=30\%$
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 11 - Probability and Statistics - 11-2 Probability - Practice and Problem-Solving Exercises - Page 685: 13
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