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20 - 24 6 22 132
25 - 29 8 27 216
30 - 34 9 32 288
35 - 39 18 37 666
40 - 44 13 42 546
45 - 49 6 47 282
Σ f = 60 Σf.Xi = 2130
maka rata - rata = 2130/60 = 35,5 jawaban E