easy · Quantitative Finance

A proprietary trading signal has a 20% prior probability of correctly identifying an outperformer. If the signal fires, the likelihood it is correct is 80%, but it also fires falsely for 30% of non-outperformers.

What is the probability the stock outperforms given the signal fired?

  1. 80%.
  2. 16%.
  3. 40%.
  4. 50%.

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