The mean = sum of 112\frac{1}{2}21, 223\frac{2}{3}32, 334\frac{3}{4}43, 445\frac{4}{5}54, and 556\frac{5}{6}65 divided by their quantity.
Mean = ( 112\frac{1}{2}21 + 223\frac{2}{3}32 + 334\frac{3}{4}43 + 445\frac{4}{5}54 + and 556\frac{5}{6}65 ) / 5
= 3.708 or 3.71( 2 d.p )
