input: Write a function to read an array from the user and then determine the mean and median of the array. The function should return the mean and median as a tuple.
  
  def mean_median(arr): 
        arr_sum = 0 
        for i in range(len(arr)): 
              arr_sum += arr[i] 
        
        mean = arr_sum/len(arr) 
      
        arr = sorted(arr) 
        if len(arr) % 2 != 0: 
              median = arr[len(arr)//2] 
        else: 
              median = (arr[len(arr)//2] + arr[len(arr)//2 - 1]) / 2
        
        return mean, median
  
  assert mean_median([10, 15, 20, 25, 30, 35])==(22.5, 22.5)
  assert mean_median([1, 2, 3, 4, 5, 6])==(3.5, 3.5)
  assert mean_median([10, 20, 30])==(20.0, 20.0)
  assert mean_median([5, 15, 15, 5])==(10.0, 10.0)
  assert mean_median([7])==(7.0, 7.0)
output: def mean_median(arr): 
        arr_sum = 0 
        for i in range(len(arr)): 
              arr_sum += arr[i] 
        
        mean = arr_sum/len(arr) 
      
        arr = sorted(arr) 
        if len(arr) % 2 != 0: 
              median = arr[len(arr)//2] 
        else: 
              median = (arr[len(arr)//2] + arr[len(arr)//2 - 1]) / 2
        
        return mean, median