one more time

app.py

@@ -90,14 +90,18 @@ bar_chart = (
     .mark_bar()
     .encode(
         y=alt.Y("Agency:N", sort="-x"),
-        x=alt.X("YTD Gross:Q", title="Total YTD Gross"),
-        tooltip=["Agency:N", "YTD Gross:Q"],
+        x=alt.X("mean(YTD Gross):Q", title="Average YTD Gross"),  # <-- take the mean
+        tooltip=[
+            "Agency:N",
+            alt.Tooltip("mean(YTD Gross):Q", title="Avg YTD Gross", format="$,.0f")
+        ],
         color=alt.condition(select_bar, alt.value("#4C78A8"), alt.value("#CCCCCC"))
     )
     .add_params(select_bar)
     .properties(width=500, height=800)
 )
 
+
 box = (
     alt.Chart(df_small)
     .mark_boxplot(size=40)