given raw data: {18, 20, 11, 10, 8, 6, 12, 4}
ordered data: {4, 6, 8, 10, 11, 12, 18, 20}
minimum = 4
maximum = 20
median = (10 + 11) / 2 = 10.5
first quartile is median of: {4, 6, 8, 10} or 7
third quartile is median of: {11, 12, 18, 20} or 15
now perform the same steps on the second set of data values
{60, 50, 130, 200, 180, 150, 100, 140}
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