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Verified answer
A) x = { ( 3 × 3 ) + ( 5 × 4 ) + ( 12 × 5 ) + ( 17 × 6 ) + ( 14 × 7 ) + ( 6 × 8 ) + ( 8 × 9) } / ( 3 + 5 + 12 + 17 + 14 + 6 + 8 )x = ( 9 + 20 + 60 + 102 + 98 + 48 + 72 ) / 55
x = 409 / 55
x = 7,4
b) syarat lulus = 7,4 - 1 = 6,4
jumlah siswa yg lulus = 14 + 6 + 8 = 28 siswa