Question

Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positive for steroids and actually use steroids. What is the probability that an athlete uses steroids, given that he tests positive?

Answer 1

Let x be the probability that an athlete uses steroids.
Then 0.12x = 0.11
Therefore
\[x=\frac{0.11}{0.12}=you\ can\ calculate\]
Multiply the result by 100 to convert to a percentage, if necessary.

Answer 2

Thanks :)

Answer 3

You're welcome :)