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  1. This question is validated if the scaled train set is:
array([[ 0.        , -1.22474487,  1.33630621],
       [ 1.22474487,  0.        , -0.26726124],
       [-1.22474487,  1.22474487, -1.06904497]])
  • The mean on axis 0 should return:
    • array([0., 0., 0.])
  • The std on axis 0 should return:
    • array([1., 1., 1.])
  1. This question is validated if the scaled test set is:
array([[ 1.22474487, -1.22474487,  0.53452248],
       [ 2.44948974,  3.67423461, -1.06904497],
       [ 0.        ,  1.22474487,  0.53452248]])