Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 4 - Probability and Counting Rules - 4-5 Probability and Counting Rules - Exercises 4-5 - Page 245: 11


a. $0.327$, b. $0.164$, c. $0.515$

Work Step by Step

Total outcomes of getting 2 out of 19: $_{19}C_2$=171 Get 2 red out of 11: $_{11}C_2$=56, $p=56/171=0.327$ Get 2 black from 8: $_8C_2$=28, $p=28/171=0.164$ Get 1 red and 1 black: $11\times8$=88, $p=88/171=0.515$ This is an ambiguous question and can not be answered.
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