input: from typing import List
  
  def runningTotal(arr: List[float]) -> np.ndarray:
      """
      Return an array with the running total of numbers in the given list.
  
      Example:
      >>> runningTotal([1, 2, 3, 4])
      array([ 1,  3,  6, 10])
      >>> runningTotal([5, 4, 3, 2, 1])
      array([ 5,  9, 12, 14, 15])
      """
output:     import numpy as np
      return np.cumsum(arr)