Răspuns:
Explicație pas cu pas:
[tex]M_a = \frac{ \frac{ {}^{6)} 1}{2} + \frac{ {}^{3)} 3}{4} + \frac{ {}^{2)} 5}{6} + \frac{7}{12} }{4} = \frac{ \frac{6 + 9 + 10 + 7}{12} }{4} = \frac{ \frac{32 {}^{(4} }{12} }{4} = \frac{ \frac{8}{3} }{4} = \frac{8}{3} \times \frac{1}{4} = \frac{8 {}^{(4} }{12} = \boxed{ \frac{2}{3}} \\ [/tex]