Agata: $\frac{1\frac{1}{2}+2\frac{1}{4}+0+5+3\frac{3}{4}}{5}=\left(1\frac{1}{2}+2\frac{1}{4}+0+5+3\frac{3}{4}\right):5=\left(1\frac{2}{4}+2\frac{1}{4}+5+3\frac{3}{4}\right):5=10\frac{5}{4}\cdot \frac{1}{5}=\frac{45}{4}\cdot \frac{1}{5}=\frac{9}{4}=2\frac{1}{2}$

Maja: $\frac{4\frac{1}{2}+2\frac{1}{2}+4+3+3\frac{1}{2}}{5}=\left(4\frac{1}{2}+2\frac{1}{2}+4+3+3\frac{1}{2}\right):5=16\frac{3}{2}\cdot \frac{1}{5}=\frac{35}{2}\cdot \frac{1}{5}=\frac{7}{2}=3\frac{1}{2}$

Zosia: $\frac{2\frac{1}{2}+\frac{1}{2}+4\frac{3}{4}+1\frac{1}{4}+3\frac{1}{2}}{5}=\left(2\frac{1}{2}+\frac{1}{2}+4\frac{3}{4}+1\frac{1}{4}+3\frac{1}{2}\right):5=\left(2\frac{2}{4}+\frac{2}{4}+4\frac{3}{4}+1\frac{1}{4}+3\frac{2}{4}\right):5=10\frac{10}{4}\cdot \frac{1}{5}=\frac{50}{4}\cdot \frac{1}{5}=\frac{10}{4}=2\frac{2}{4}=2\frac{1}{2}$