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Calculati media anuala a lui Andrei stiind ca are urmatoarele medii:
7,50 8 9 8,50 7 10 10 9 8 9 8,50 9


Răspuns :

 [tex]m_{(an)}=(7,50+8+9+8,50+7+10+10+9+8+9+8,50+9) :12\\ m_{(an)}\approx8,62[/tex]