[填空题]
When doing a physical experiment, Peter measurn yrfa1n64 zw(ojef , s)crs9k,n72v res the mnj: 85i,ydt.qvh gb/ aass of an object ten times. All of the .q hdb,j/ nga iv5:t8ymeasurements 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)
