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b. Rata-rata :
(5x4) + (6x8) + (7x15) + (8x12) + (9x1) : 40 (karna jumlah seluruh data)
(20 + 48 + 105 + 96 + 9) : 40
278 : 40
=6,95
5) a. Modus : 8 (karna 8 yg bnyak diperoleh)
b. Rata-rata :
(7x3) + (8x5) + (9x1) : 9 (karna jumlah seluruh data)
(21 + 40 + 9) : 9
70 : 9
= 7,78