Mean, Var, and Std

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    import numpy as np

    i, j = map(int, input().split())

    arr = np.array([list(map(int, input().split())) for _ in range(i)])

    print(np.mean(arr, axis=1)) print(np.var(arr, axis=0))

    std_value = np.std(arr, axis=None) if std_value == 0: print("0.0") else: print(f"{std_value:.11f}")