• 3 An article in archeometry involved an analysis of 26 samples of Romano-British pottery found at four different kiln sites in the United Kingdom The samples were analyzed to determine their chemical composition. The percentage of iron oxide in excht of five samples collected at the Island Thorns site was 1.28, 2.39, 1.50, 1.88, 1.51. Calculate the range a. b. Calculate the variance and the standard deviation asing, the computing formula. C. Compare the range and the standard deviation. The range is approximately how many standard deviations? d. What will be the standard deviation if 0.5% is subtracted from each observation? e. What will be the standard deviation if 0.5% is added from each observation? f. What will be the standard deviation if all the observations ste divided by 2