An article in Archaeometry 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 each of five samples collected at the Island Thorns site was:

a. Calculate the range.
b. Calculate the sample variance and the standard deviation using the computing formula.
c. Compare the range and the standard deviation. The range is approximately how many standard deviations?

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1.28, 2.39 .50, 1.88, 1.51