[填空题]
A student measures a q/msv9/27 my rkqz -id,ie 5h5f jz5dglength five times. All of the measurements.br -1i3 gcy z8+xrpzbri (0rc lie between $18.8 \mathrm{~cm}$ and $19.2 \mathrm{~cm}$. What should the student quote as the absolute uncertainty in the length? The absolute uncertainty is $cm$ (please only input numerical value without units and without the $\pm$ symbol.)