[填空题]
A student is measuri thbsqc*t9; 2q /rgt i8kulq on17hu/,30ut l*mm i8 x3w:wsp4hihaw uq6f-b3 ng the density of a solution. He recorded the data in the fo:s3h wi *6 uhw34qmfiax8 0 w3lbp-mutllowing 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.
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