Question 755077
In California, 50% of all teenagers own a skateboard and 40% of all teenagers own a skateboard and roller blades. What is the probability that a teenager owns roller blades given that the teenager owns a skateboard 
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P(blades | skateboard) = P(blades AND skateboard)/P(skateboard)
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= 0.4/0.5 = 0.8
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Cheers,
Stan H.
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