Sabine records the daily heights of a random sample of bamboo stalks, in inches. They are: 20, 19, 17, 16, 18, 15, 20, 21 Consider the formulas: A s = (x + (x2-x++ (xx B:s= 12-1 {(x-x1) + (x 2 = x) + ... + (x x) n-1 C: = (1-4)+(x2)+...+(x-4) D: = N {(x 4) + (x2 ) + ... + (xw ) - N Which formula should you use for variance? Which formula should you use for standard deviation? DONE