[填空题]
A student measures a length five time3drjc 8+q+wor s. All of the /tz+pdqcqy wia t9u+x w4qbq6 6hg078measurements 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.)