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karena
mean = nilai data / banyak data
72 = 50×2+60×3+70×6+80×7+90×2 / 2+3+6+7+2
72 = 100+180+420+560+180 / 20
72 = 1440 / 20
72 = 72
atau
mean = nilai data / banyak data
72 = 1020 + 70a / 14 + a
1020 + 70a = 72 (14 + a)
1020 + 70a = 1008 + 72a
70a - 72a = 1008 - 1020
-2a = -12a
a = -12/-2
a = 6 (d)
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