Let X be a time series of 0's and 1's indicating the outcome of each trial (0 is failure, 1 is success). Write a function relative_freq(arr) where the input arr is a 1-d array of 0's and 1's. The function returns a 1-d array of the same size, of which each element is the relative frequency of success at the current time point. For example, X = [0,0,1,0,0,1,1,0,0,1] shows the result of 10 trials at time points 1,2,3,...,10. The function will find the relative frequency of success at each time point, i.e.p^=[0/1,0/2,1/3,1/4,1/5,2/6,3/7,3/8,3/9,4/10] (Hint: use cumsum.)

Write the code in Python and show output.