/usr/include/OpenMS/MATH/STATISTICS/ is in libopenms-dev 1.11.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/OpenMS/MATH/STATISTICS/AsymmetricStatistics.h
/usr/include/OpenMS/MATH/STATISTICS/AveragePosition.h
/usr/include/OpenMS/MATH/STATISTICS/BasicStatistics.h
/usr/include/OpenMS/MATH/STATISTICS/GammaDistributionFitter.h
/usr/include/OpenMS/MATH/STATISTICS/GaussFitter.h
/usr/include/OpenMS/MATH/STATISTICS/GumbelDistributionFitter.h
/usr/include/OpenMS/MATH/STATISTICS/Histogram.h
/usr/include/OpenMS/MATH/STATISTICS/LinearRegression.h
/usr/include/OpenMS/MATH/STATISTICS/PosteriorErrorProbabilityModel.h
/usr/include/OpenMS/MATH/STATISTICS/ROCCurve.h
/usr/include/OpenMS/MATH/STATISTICS/StatisticFunctions.h
/usr/include/OpenMS/MATH/STATISTICS/sources.cmake