[填空题]
When doing a physicalgi /vui/fj +68-kwqi kss m7/: ye)f-s2 h /icquzfe7r experiment, Peter measures the mass of an object ten times. All of the measu eh)/esm sy2crfzf77-i/qs :urements lie between $49.8 \mathrm{~g}$ and $50.2 \mathrm{~g}$. What should him quote as the absolute uncertainty in the mass? $\pm$ $g$ (Only put numerical value in the blank without any units or signs)
