Sangeetha Pulapaka
0

This list can be split up into four equal groups of five:

Therefore:

Q1 is the mean of 9 and 11 = (9 + 11) ÷ 2 = 10

Q2 is the mean of 18 and 20 = (18 + 20) ÷ 2 = 19

Q3 is the mean of 16 and 17 = (31 + 33) ÷ 2 = 32


Therefore the interquartile range = Q3 - Q1 = 32 - 10 = 22

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