Calculati media arihmetica a nr: 19,5 ; 8,67 ;14,13 si 7
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Răspuns :

m.a.=(19,5+8,67+14,13+7):4=
m.a. =(28,17+21,13):4=
m.a. =49,3:4=
m.a. =12,325
Ma = (19.5 + 8.67 + 14.13 + 7) : 4 

Ma = 49.3 : 4

Ma = 12.325