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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def Mean(self):
 """Computes the mean of a CDF. Returns: float mean """

        old_p = 0
        total = 0.0
        for x, new_p in zip(self.xs, self.ps):
            p = new_p - old_p
            total += p * x
            old_p = new_p
        return total