Challenge - #38 - Introduction to Sets

 def average(array):

    # your code goes here
    lst = list(set(array))
    avg_height = sum(lst)/len(lst)
    return avg_height

if __name__ == '__main__':
    n = int(input())
    arr = list(map(int, input().split()))
    result = average(arr)
    print(result)

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