Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 4 - Probability - 4-3 Addition Rule - Page 155: 26

Answer

a)21.4% b)85.7% c)The labels described as ratio are much better.

Work Step by Step

a) We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, hence probability=$\frac{3}{11+3}=0.214=21.4$%. b) We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, hence probability=$\frac{12}{12+2}=0.857=85.7$%. c) By seeing the earlier results, the labels described as ratio are much better.
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