[填空题]
A student measures a lengtv.oes1q19mo0 vk*c3 eqp5q7kh zdd2eh five times. All of the meam4u 0,f xofya:) rk)fbsurements 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.)