Răspuns:
[tex] \bf a) \: \: M_a = \frac{12 + 18}{2} \\ \\ \bf M_a = \frac{30}{2} \Rightarrow \red{\boxed{\bf M_a = 15}} [/tex]
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[tex] \bf b) \: \: M_a = \frac{204 + 305}{2} \\ \\ \bf M_a = \frac{509}{2} \Rightarrow \blue{\boxed{\bf M_a = 254.5}} [/tex]
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[tex] \bf c) \: \: M_a = \frac{7 + 8.4}{2} \\ \\ \bf M_a = \frac{15.4}{2} \Rightarrow \green{\boxed{\bf M_a = 7.7}} [/tex]
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[tex] \bf d) \: \: M_a = \frac{9 + 14.32}{2} \\ \\ \bf M_a = \frac{23.32}{2} \Rightarrow \orange{\boxed{\bf M_a = 11.66}} [/tex]
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[tex] \bf e) \: \: M_a = \frac{10.5 + 47.34}{2} \\ \\ \bf M_a = \frac{57.84}{2} \Rightarrow \pink{\boxed{\bf M_a = 28.92 }} [/tex]
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[tex] \bf f) \: \: M_a = \frac{10 + 12 + 30.2}{3} \\ \\ \bf M_a = \frac{22 + 30.2}{3} \\ \\ \bf M_a = \frac{52.2}{3} \Rightarrow \purple{\boxed{\bf M_a = 17.4 }} [/tex]
