PAEYNDAH, Azizullah. Role of Variance on Mathematical Expectation. Journal of Natural Sciences – Kabul University, [S. l.], v. 3, n. 2, p. 149–158, 2020. DOI: 10.62810/jns.v3i2.164. Disponível em: https://jns.edu.af/jns/article/view/164. Acesso em: 4 apr. 2025.