class_docstr: Class for incrementally computing the mean of a series of numbers.
class_docstr_tok: ["Class","for","incrementally","computing","the","mean","of","a","series","of","numbers","."]
code: def drop(self, x):
      assert isinstance(x, (int, float))
      if self.n == 0:
          return
      self.n -= 1
      if self.n == 0:
          self.sum = None
      else:
          self.sum -= float(x)
  
imports: from abc import abstractmethod
  from typing import List
  from math import sqrt
  import numpy
label_desc: Use image node_id 6 for calling the Mean obj's underlying member method code with example usage: obj.drop(x) without return types