Variable | Price | Weights | |
---|---|---|---|
Base Year | Current Year | ||
X | 30 | 50 | 8 |
Y | 10 | 15 | 7 |
Z | 25 | 30 | 4 |
Let the Mean and Variance of five observations $ x_i $, $ i = 1, 2, 3, 4, 5 $ be 5 and 10 respectively. If three observations are $ x_1 = 1, x_2 = 3, x_3 = a $ and $ x_4 = 7, x_5 = b $ with $ a>b $, then the Variance of the observations $ n + x_n $ for $ n = 1, 2, 3, 4, 5 $ is