diff --git a/src/2026-01-30/presentation.tex b/src/2026-01-30/presentation.tex
index 34f3511..c24d1c9 100644
--- a/src/2026-01-30/presentation.tex
+++ b/src/2026-01-30/presentation.tex
@@ -332,8 +332,8 @@
         &= P\left(\frac{125 - 150}{\sqrt{145{,}5}} \le \frac{\tilde{S}_N -
             E(\tilde{S}_N)}{\sqrt{V(\tilde{S}_N)}} \le \frac{180 -
         150}{\sqrt{145{,}5}}\right) \\
-        &\approx \Phi(2.487) - \Phi(-2.726) \\
-        &= \Phi(2.487) - (1 - \Phi(2.726)) = 97{,}4
+        &\approx \Phi(2{,}487) - \Phi(-2{,}073) \\
+        &= \Phi(2{,}487) - (1 - \Phi(2{,}073)) \approx 0{,}974
     \end{align*}
 \end{frame}