input: from typing import List
  
  def runningTotal(arr: List[int]) -> np.ndarray:
      """
      Calculate the running total of numbers in a given list using numpy.
      
      >>> runningTotal([1, 2, 3, 4, 5])
      array([ 1,  3,  6, 10, 15])
      >>> runningTotal([10, -2, 3, 0, 7])
      array([10,  8, 11, 11, 18])
      """
      return np.cumsum(arr)
output:     import numpy as np