[填空题]
A student is measuring xjwq7r/60.a 7gx20wgxlg , qt1okrhcthe density of a solution. He ryp(gi.23o(qapb s z7 cecorded the data in the followinip2q3a (b zo(sp.ycg7g table.
1.Write the expression of the average density of the solution in a fraction form (make sure to include the absolute uncertainties for each physical quantity).
2.Calculate its corresponding uncertainty. Show your work clearly.
$\pm$ %
