The probability that a randomly selected adult belongs to a health club and goes there twice a week at least is 4.0.
Using the general multiplication rule,
The probability that a randomly selected adult belongs to a health club and goes there twice a week at least can be given as follows:
Given that, 10% of adults belong to health clubs and 40% go the club at least twice a week.
P(go to health club at least twice a week)
=P(health club member)*P(go >= twice a week | health club member)
= 10% * 40%
= 4.0
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