CL fi xi fixi 10 – 15 8 12.5 100 8 9.5 – 15.5

16 - 21 10 18.5 185 18 15.5 – 21.5

22 - 27 8 24.5 196 26 21.5 – 27.5

28 - 33 4 30.5 122 30 27.7 – 33.5

n = 30 ∑ =603

n/2 = 30/2 = 15 i = 6

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