50,80,60,90,60,80,70,65,80,90.

60,90,55,60,75,60,65,70,80,50.
70,80,60,90,70,85,60,75,90,70.
tentukan Mean/rata rata hitung

50,80,60,90,60,80,70,65,80,90.

Jawaban Terkonfirmasi

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Data | Frekuensi
50    | 2
55    | 1
60 | 7
65    | 2
70 | 5
75 | 2
80 | 5
85 | 1
90 | 5
Total   | 30

Mean ( x ) = $frac{(50 star 2 ) + (55 star 1 ) + (60 star 7 ) + (65 star 2 ) + (70 star 5 ) + (75 star 2 ) + (80 star 5 ) + (85 star 1 ) + (90 star 5 ) }{30} \ \ frac{100 + 55 + 420 + 130 + 350 + 150 + 400 + 85 + 450}{30} \ \ frac{2140}{30} \ \ 71 , 333$

Hasilnya adalah:71,3333333