Mean, Var, and Std

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    import numpy as np

    i = input()

    n,m = list(map(int,i.split(' ')))

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

    print(np.mean(arr,axis=1)) print(np.var(arr,axis=0)) print(np.round(np.std(arr,axis=None),11))