In Exercises 47 and 48, use the inverse matrix found in Exercise 34 to solve the system of linear equations. x1 2x2 x3 2x43x1 5x2 2x3 3x42x1 5x2 2x3 5x4x1 4x2 4x3 11x40112x y z

Measures of Variation Thursday, August 22:05 PM Range, Standard Deviation, and Variance We'll be focusing on the ones in bold. Range is the max - min, it is difficult to interpret on it's own A lot of statisticians use standard deviation, which is a measure of deviation from the mean. It is calculated as follows Test Score x - x bar (x - x bar)^2 previous number/(n-1) (previous #)^(1/2) 70 70 - 70.3 (….)^2 71 71 - 70.3 72 72 - 70.3 70 70 - 70.3 69 69 - 70.3 70 70 - 70.3 **If you're given the formula to compute the standard deviation with the computational formula, pay attention to the x^ 2 INSIDE the parentheses and the x then the square outside of it. Variance is the standard deviation squared. S