Complete the chart to find the mean, variance, and standard deviation. Remember to use commas and round numbers to the nearest tenth. X X X - X (X - X)2 1. 900 = 466.2 = The mean is 2. 35 = -398.8 = 159,041.4 The variance is 99,667.2 3. 500 = 66.2 = The standard deviation is 4. 300 = -133.8 = n = Σ X = X = Σ (X - X)2 = 398,668.6