80, 70, 90, 70, 60, 70, 70, 90, 70, 100
60, 70, 70, 100, 70, 80, 70, 70, 80, 80
80, 80, 70, 70, 80
Mean dari data tersebut adalah...
A. 75
B. 76
C. 77
D. 80
pembahasan :
= (60 x 2) + (70 x 12) + (80 x 7) + 90 x 2) + (100 x
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= 120 + 840 + 560 + 180 + 200
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= 1900
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