fixed a few broken tests

Author: SaturnFromTitan

pandas/core/apply.py

@@ -343,6 +343,7 @@ def apply_series_generator(self) -> Tuple[ResType, "Index"]:
     def wrap_results(
         self, results: ResType, res_index: "Index"
     ) -> Union["Series", "DataFrame"]:
+        from pandas import Series
 
         # see if we can infer the results
         if len(results) > 0 and 0 in results and is_sequence(results[0]):
@@ -354,7 +355,7 @@ def wrap_results(
         constructor_sliced = self.obj._constructor_sliced
         is_empty = isinstance(results, (list, tuple, dict)) and not results
         if constructor_sliced is Series and is_empty:
-            result = constructor_sliced(results, dtype=object)
+            result = constructor_sliced(results, dtype=np.float64)
         else:
             result = constructor_sliced(results)
         result.index = res_index

pandas/tests/frame/test_analytics.py

@@ -1067,7 +1067,7 @@ def test_mean_mixed_datetime_numeric(self, tz):
         tm.assert_series_equal(result, expected)
 
     @pytest.mark.parametrize("tz", [None, "UTC"])
-    def test_mean_excludeds_datetimes(self, tz):
+    def test_mean_excludes_datetimes(self, tz):
         # https://github.com/pandas-dev/pandas/issues/24752
         # Our long-term desired behavior is unclear, but the behavior in
         # 0.24.0rc1 was buggy.