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=167/20
=8,35
= (5 x 1) + (6 x 1) + (7 x 3) + (8 x 4) + (9 x 7) + (10 x 4) /1 + 1 + 3 +4 + 7 + 4
= 167 / 20
= 8,35
kayak gini :)