Write a python script to do the following: Generate 5 arrays (of length 1000) of random integers in [1, 5] with uniform distribution. For each array X, compute the array S, where S [i], i = 0, 1, ..., 999, is the average of the first i + 1 elements of X. Plot all the 5 arrays S computed above in the same figure, and save the figure (see instructions below). You may only use the following packages: numpy, matplotlib, os, sys, getopt