An investment manager who outperforms the market in 15 out of a possible 30 days would have a statistical batting average of 50. The longer the time period taken in the sample size, the more statistically significant the measure becomes. Many analysts use this simple calculation in their broader assessments of individual investment managers.
1. спорт. средний уровень (чьих-л. достижений)
2. разг. общий уровень (чьей-л. подготовки, успехов и т. п.)