input: import numpy as np
  
  def runningTotal(arr):
      """ Return an array with the running total of numbers in the given list.
      >>> runningTotal([1, 2, 3, 4])
      array([ 1,  3,  6, 10])
      >>> runningTotal([5, -2, 0, 7])
      array([ 5,  3,  3, 10])
      """
      return np.cumsum(arr)
output:     return np.cumsum(arr)