public void Variance_ReturnsExpected()
        {
            var analysis = new RestaurantAnalysis();
            var inputs = new List<double>();
            inputs.Add(1.0);
            inputs.Add(2.0);
            inputs.Add(3.0);

            Double expected = 2f / 3f;
            var actual = analysis.Variance(inputs);
            Assert.AreEqual(expected, actual);
        }