List of Weights (in pounds) : 204, 207, 208, 212, 214, 215.
a. Variance
- cari dulu mean = (204+207+208+212+214+215) / 6 = 210 pounds
- cari variance = [ (204-210)² + (207-210)² + (208-210)² + (212-210)² + (214-210)² + (215-210)² ] / 6 = 15.667 pounds
b. Standard Deviation
- standard deviation = sqrt of variance = 15.667 pow ½ (15.667 pangkat ½) = 3.95 pounds