Update duckdb index files

.gitattributes

@@ -183,3 +183,4 @@ middle_school_physics/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 modern_chinese_history/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 professional_tour_guide/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 professional_tour_guide/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
+probability_and_statistics/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text

probability_and_statistics/dev/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4a60c77f6a8ae1e6dc26a41f373375deab9b5540d5feb4e0225fb4d74b870a56
+size 1060864