A Manufacturer Claims That Its Drug Test Will Detect Steroid

Multiple Choice

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.Further, 15% of all steroid-free individuals also test positive.10% of the rugby team members use steroids.Your friend on the rugby team has just tested positive.The probability that he uses steroids is ________________________ .

A) 0.4130
B) 0.8636
C) 0.0950
D) 0.2300