diff --git a/ch_probability/TeX/ch_probability.tex b/ch_probability/TeX/ch_probability.tex
index 8d09213..0b7483b 100644
--- a/ch_probability/TeX/ch_probability.tex
+++ b/ch_probability/TeX/ch_probability.tex
@@ -1914,7 +1914,7 @@ \subsection{Variability in random variables}
 $y_i\times P(Y=y_i)$ & 0.00 & 39.75 & 120.00 & $E(Y) = 159.75$\\
 $y_i-E(Y)$ & -159.75 & -0.75 & 40.25 & \\
 $(y_i-E(Y))^2$ & 25520.06 & 0.56 & 1620.06 & \\
-$(y_i-E(Y))^2\times P(Y)$ & 3828.0 & 0.1 & 972.0 & $Var(Y) \approx 4800$ \\
+$(y_i-E(Y))^2\times P(Y=y_i)$ & 3828.0 & 0.1 & 972.0 & $Var(Y) \approx 4800$ \\
    \hline
 \end{tabular}
 \end{center}}