[填空题]
A student measures ak;2joejt2 m3 laug+6c lengwxfc yx(:/ k,cth five times. All of the 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)
