def calc_mean_and_variance_of_variances(self, NumberOfOscillations):
        """
        Calculates the mean and variance of a set of varainces. 
        This set is obtained by splitting the timetrace into chunks 
        of points with a length of NumberOfOscillations oscillations.  

        Parameters
        ----------
        NumberOfOscillations : int
            The number of oscillations each chunk of the timetrace 
            used to calculate the variance should contain.

        Returns
        -------
        Mean : float
        Variance : float
        """
        SplittedArraySize = int(self.SampleFreq/self.FTrap.n) * NumberOfOscillations
        VoltageArraySize = len(self.voltage)
        SnippetsVariances = _np.var(self.voltage[:VoltageArraySize-_np.mod(VoltageArraySize,SplittedArraySize)].reshape(-1,SplittedArraySize),axis=1)

        return _np.mean(SnippetsVariances), _np.var(SnippetsVariances)