Pj is the population size of group j, yj is the average health level of group j, and μ is the average health level of the entire population.\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \boldsymbol{T}={\displaystyle \sum_{\boldsymbol{j}-\boldsymbol{1}}^{\boldsymbol{J}}{\boldsymbol{p}}_{\boldsymbol{j}}}{\boldsymbol{r}}_{\boldsymbol{j}}\boldsymbol{In}{\boldsymbol{r}}_{\boldsymbol{j}}\times \boldsymbol{1000} $$\end{document}T=∑j−1JpjrjInrj×1000