List.Mode Function in Power Query
The List.Mode function returns an item that appears most commonly in a list. If multiple items appear with the same maximum frequency, the last one is chosen. If the list is empty an exception is thrown.
Syntax
 List.Mode(list as list, optional equationCriteria as any) as any 
Example:
Power Query M
let
  source = {"India", "America", "Canada", "Japan", "Australia", "England", "America"}, 
  return = List.Mode(source)
in
    return   The output of the above code is “America”.
Example:
Power Query M
let
  source = {"India", "America", "Canada", "Japan", "Australia", "England", "China"}, 
  return = List.Mode(source)
in
    return   The output of the above code is China.