[填空题]
A student measures a length five -m4//+n hknbuvu:dqaj5sk2q times. All of the *.rcfib8 cg6ndm-4h z gftzg9 +abu55 measurements 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 $cm$ (Do not include the $\pm$ symbol nor the unit)
