Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 4 - Probability - 4-5 Multiplication Rule: Complements and Conditional Probability - Basic Skills and Concepts: 8

Answer

$0.3439$

Work Step by Step

Complement of P(A) is that at least of the digits is seven. The four times we select, we can choose any 9 options out of the 10, therefore: $P(\overline{A})=1-P(A)=1-(\frac{9}{10})^{4}=0.3439$
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