Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 6 - Section 6.1 - Assess Your Understanding - Vocabulary and Skill Building - Page 330: 15

Answer

$0.3$

Work Step by Step

According to the first Rule for a Discrete Probability Distribution (see page 323): $∑P(x)=1$ $P(3)+P(4)+P(5)+P(6)=1$ $0.4+P(4)+0.1+0.2=1$ $P(4)=1-0.4-0.1-0.2$ $P(4)=0.3$ Notice that: $0\leq P(4)\leq1$ (second Rule)
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