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Write a function to compute the moving average of a list of integers with a given window size k. The moving average is the mean of the last k elements in a sliding window.


def moving_average(arr: List[int], k: int) -> List[float]:
    pass



Input:
arr = [1, 2, 3, 4, 5]
k = 3

Output:
[2.0, 3.0, 4.0]  # Averages for windows [1,2,3], [2,3,4], [3,4,5]


Input:
arr = [5, 10, 15, 20, 25, 30] 
k = 4

Output: 
[12.5, 17.5, 22.5]


Input: 
arr = [1, 2]
k = 5

Output: 
[ ]