code: def test_groupby_mean_no_overflow():
      # Regression test for (#22487)
      df = DataFrame(
          {
              "user": ["A", "A", "A", "A", "A"],
              "connections": [
                  4970,
                  4749,
                  4719,
                  4704,
                  18446744073699999744,
              ],
          }
      )
      assert (
          df.groupby("user")["connections"].mean()["A"]
          == 3689348814740003840
      )
  
imports: import builtins
  import datetime
  from string import ascii_lowercase
  import numpy
  import pytest
  from pandas._libs.tslibs import iNaT
  import pandas
  from pandas import DataFrame, MultiIndex, Series, Timestamp, date_range, isna
  import pandas._testing
  from pandas.util import _test_decorators
label_desc: Use image node_id 14 for calling a global function with example usage: test_groupby_mean_no_overflow() without return types