input: from typing import List
  
  def runningTotal(arr: List[int]) -> np.ndarray:
      """
      Return an array with the running total of numbers in a given list using numpy.
  
      >>> runningTotal([1, 2, 3, 4])
      array([1, 3, 6, 10])
      >>> runningTotal([5, 5, 5, 5])
      array([5, 10, 15, 20])
      """
      return np.cumsum(arr)
output:     import numpy as np