In a study of a possible correlation between the height in $\operatorname{cm}(X)$ and weight in $\mathrm{kg}$ $(Y)$ of chimpanzees, a sample of 40 animals produces a correlation coefficient of $r=+0.813$ and a regression line with equation $\hat{Y}=0.34 X+19.5 .$ What is the expected weight of an $80 \mathrm{~cm}$ tall chimpanzee?