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X -- F -- FX
5 × 8 = 40
6 × 7 = 42
7 × 6 = 42
8 × 3 = 24
9 × 2 = 18
10×4 = 40
---------------- +
F=30
FX=206
Mean = FX:X=206:30= 6,87
Median =(X15+X16)/2=(7+6)/2=13/2=6,5
Modus = 5