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50-54 3 52 156 ----> xi = 54+50 / 2 = 104/2 = 52
55-59 12 57 684
60-64 23 62 1426
65-69 8 67 536
70-74 4 72 288
----------------------- +
50 3090
rata² = ∑xi.fi / ∑f
= 3090 / 50
= 61,8 Kg