Kupenova, Zh. K., G. E. Zhunisova, and A. M. Zhyenbekova. “Mean Values and Indicators of Variations in Statistics”. Journal of Economic Research & Business Administration 109, no. 3 (April 24, 2016). Accessed December 22, 2024. https://be.kaznu.kz/index.php/math/article/view/1067.