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1. Use the Gaussian Elimination method to solve: 1x + 2y + 3z = 142x + 1y + 3z = 132x + 3y + 1z = 11(iv)Subtract the value of y from y, z from z and then numerical value, we find following twoequations,-3y -3z = -15(v)-y -5z = -17
2. The relative frequency distribution of the number of TVs sold in a day in a department store in the last year is as follows:Number of TV sold: 0 1 2 3 4Probability 0.35 0.3 0.2 0.1 0.05Compute the mean and standard deviation of this distribution.