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In a study of a possible correlation between the height in $\mathrm{cm}(X)$ 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?
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