Update duckdb index files

.gitattributes

@@ -201,3 +201,4 @@ middle_school_physics/val/index.duckdb filter=lfs diff=lfs merge=lfs -text
 modern_chinese_history/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 marxism/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mao_zedong_thought/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
+probability_and_statistics/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

probability_and_statistics/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:53fa1c5300f4b66008a82d8a2579d896cc185d2445b350a07d29fd6483aba371
+size 1060864