Introduction to Sets

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    def average(array):
        new_array = set(array)
        sum = 0
        l = len(new_array)
        for i in new_array:
            sum += i
        avg = sum / l
        return avg    
            
    
    if __name__ == '__main__':
        n = int(input())
        arr = list(map(int, input().split()))
        result = average(arr)
        print(result)