a manufacturer claims that its drug test will detect steroid use(that is ,show positive for an athlete who uses steroids)95% of the time.what the company does not tell you is that 15% of all steroid-free individuals also test positive(the false

positive rates).10% of the rugby team members use steroid.

问题:what is the probability that a rugby team member use steroids.

10% of the rugby team members use steroid.
问题:what is the probability that a rugby team member use steroids

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