Please check my work: Check if these are correct: absolute uncertainties relative uncertainties average period percent difference formulas proper sig figs and decimals for each thanks

\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|} \hline \multicolumn{2}{|l|}{ First length } & units & & & \multicolumn{2}{|c|}{ Second length } & (units) & & \\ \hline L= & 56.83 & cm & & & L= & 30.16 & cm & & \\ \hlineL= & 0.5 & mm & & & L= & 0.5 & mm & & \\ \hline \multirow[t]{2}{*}{ trial } & timeinterval & N & Period & & trial & timeinterval & N & Period & \\ \hline & (sec) & & (sec) & & & (sec) & & (sec) & \\ \hline 1 & 15.77 & 10 & 1.577 & & 1 & 11.54 & 10 & 1.154 & \\ \hline 2 & 15.65 & 10 & 1.565 & & 2 & 11.56 & 10 & 1.156 & \\ \hline 3 & 15.61 & 10 & 1.561 & & 3 & 11.62 & 10 & 1.162 & \\ \hline \multirow[t]{3}{*}{4} & 15.75 & 10 & 1.575 & & 4 & 11.67 & 10 & 1.167 & =G16/H16 \\ \hline & & Averageperiod= & 1.570 & & & & Averageperiod= & 1.160 & = AVERAGE (I13:I16) \\ \hline & & T= & 0.004 & & & & T= & 0.003 & =STDEV(I13:I16)/2 \\ \hline \multicolumn{10}{|c|}{ Calculating g } \\ \hline & g & g & Relativeunc. & \begin{tabular}{|c} Percentdiff. \\ \end{tabular} & & & & & \\ \hline units & ms2 & & & & & & PI= & 3.141593 & \\ \hline First L & 9.11 & 0.1 & 1 & 7.06% & & & & & \\ \hline \multirow[t]{7}{*}{ Second L } & 8.85 & 0.2 & 2 & 9.67% & & & & & \\ \hline & \multicolumn{3}{|c|}{=4232(Gg/100)/1172} & & & & & & \\ \hline & & \multicolumn{4}{|c|}{=B25SQRT((G10/G9)2+(218/I17)2)} & & & & \\ \hline & & & \multicolumn{2}{|c|}{=(C25/B25)100} & & & & & \\ \hline & & & & \multicolumn{3}{|c|}{=ABS((B259.8)/9.8)} & & & \\ \hline & & & & & & & & & \\ \hline & & & & & & & & & \\ \hline \end{tabular}