Which data set has a wider spread? why? set a: {9, 11, 24, 11, 4, 20, 16, 7, 18, 15, 28, 6}
set b: {9, 12, 15, 3, 21, 24, 5, 9, 16, 21}

A measure of spread, sometimes also called a measure of dispersion, is used to describe the variability in a sample or population. One measure is would be the range. The range of a set of data is the difference between the highest and lowest values in the set. Therefore,

Set A: range = 28 - 4 = 24
Set B: range = 24 - 3 = 21

Set A is the data set which has a wider spread. Hope this answers the question.