[填空题]
When doing a physical experiment,-w hm+2qp aqwqq.c-* f Peter measures t*5(daru wu2w/bje ;oyhe mass of an object ten times. All of the measurements lie bed y/ou2rw; ue5w j(b*atween $49.8 \mathrm{~g}$ 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)
