Oblicz średnią arytmetyczną liczb
a)
b) [tex]7 \frac{1}{2} 5 \frac{3}{4} 10 \frac{1}{2} 8,25[tex]
c) [tex]1,75 [tex]2\frac{1}{4} ; 2 [tex]1\frac{5}{6} ; 2\frac{1}{6}[tex]
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