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