The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 13 - General Rules of Probability - Apply Your Knowledge - Page 313: 13.9

Answer

P(go to health club at least once a week) = P(goes to health club ∩ once a week) = P(Goes to health club) x P(once a week | Goes to health club) = 0.1 x 0.4 = 0.04

Work Step by Step

P(go to health club at least once a week) = P(goes to health club ∩ once a week) = P(Goes to health club) x P(once a week | Goes to health club) = 0.1 x 0.4 = 0.04
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