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73 = (32 . 70 - 3 . x2)/(32 - 3)
73 = (2240 - 3x2)/29
73 . 29 = 2240 - 3x2
2117 = 2240 - 3x2
3x2 = 2240 - 2117
x2 = 123 : 3
x2 = 41
Jawaban: A
40. rata-rata = (12 . 3 + 15 . 4 + 17 . 1 + 21 . 2 + 26 . 2 + 30 . x)/(3 + 4 + 1 + 2 + 2 + x)
19,8 = (36 + 60 + 17 + 42 + 52 + 30x)/(12 + x)
19,8(12 + x) = 207 + 30x
237,6 + 19,8x = 207 + 30x
237,6 - 207 = 30x - 19,8x
30,6 = 10,2x
x = 30,6 : 10,2
x = 3
Jawaban: A