def METHOD_NAME(self):
    r"""Return expected value of the distribution.
    Let :math:`X` be a random variable with the distribution of `self`.
    Returns the expectation :math:`\mathbb{E}[X]`
    Returns
    -------
    pd.DataFrame with same rows, columns as `self`
    expected value of distribution (entry-wise)
    """
    mean_arr = self._mu
    return pd.DataFrame(mean_arr, index=self.index, columns=self.columns)