## 4 Research Methods
\begin{table}
\begin{tabular}{c c c c c c c} \hline  & **Class** & **Frequency** & \(\sigma\)**-Sigma** & **SD** & **MSD** & **S/N** \\ \hline \multirow{4}{*}{**10**} & 10.139999–10.400000 & 368 & \(1\sigma\downarrow\) & \multirow{4}{*}{25.57831} & \multirow{4}{*}{50.71853} \\  & 10.400000–10.660000 & 367 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 10.660000–10.920000 & 307 & \(1\sigma\downarrow\) & & \(8.62284\times 10^{-6}\) & 50.71853 \\ \cline{2-5}  & 10.920000–11.179999 & 332 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**11**} & 11.179999–11.440000 & 271 & \(1\sigma\downarrow\) & \multirow{4}{*}{11.11306} & \multirow{4}{*}{1.42105 \(\times\) 10\({}^{-5}\)} & \multirow{4}{*}{48.49763} \\  & 11.440000–11.700000 & 278 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 11.700000–11.959999 & 267 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 11.959999–12.219999 & 248 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**12**} & 12.219999–12.480000 & 219 & \(1\sigma\downarrow\) & \multirow{4}{*}{27.18251} & \multirow{4}{*}{3.25286 \(\times\) 10\({}^{-5}\)} & \multirow{4}{*}{45.13756} \\  & 12.480000–12.740000 & 164 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 12.740000–13.000000 & 159 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**13**} & 13.000000–13.259999 & 190 & \(1\sigma\downarrow\) & \multirow{4}{*}{17.49286} & \multirow{4}{*}{3.41216 \(\times\) 10\({}^{-5}\)} & \multirow{4}{*}{44.81098} \\  & 13.520000–13.780000 & 168 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 13.780000–14.039999 & 148 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**14**} & 14.039999–14.299999 & 131 & \(1\sigma\downarrow\) & \multirow{4}{*}{7.885905} & \multirow{4}{*}{6.94956 \(\times\) 10\({}^{-5}\)} & \multirow{4}{*}{41.63774} \\  & 14.29999–14.559999 & 123 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 14.559999–14.820000 & 120 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 14.820000–15.080000 & 109 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**15**} & 15.080000–15.339999 & 82 & \(1\sigma\downarrow\) & \multirow{4}{*}{7.516648} & \multirow{4}{*}{2.05102 \(\times\) 10\({}^{-4}\)} & \multirow{4}{*}{37.02517} \\  & 15.533999–15.59999 & 69 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 15.599999–15.860000 & 72 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 15.860000–16.119999 & 61 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**16**} & 16.119999–16.379999 & 56 & \(1\sigma\downarrow\) & \multirow{4}{*}{4.716991} & \multirow{4}{*}{3.5741 \(\times\) 10\({}^{-4}\)} & \multirow{4}{*}{34.56708} \\  & 16.379999–16.639999 & 49 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 16.639999–16.90000 & 60 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 16.900000–17.160000 & 49 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**17**} & 17.160000–17.420000 & 45 & \(1\sigma\downarrow\) & \multirow{4}{*}{5.931905} & \multirow{4}{*}{7.76464 \(\times\) 10\({}^{-4}\)} & \multirow{4}{*}{31.42253} \\  & 17.420000–17.680000 & 32 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 17.680000–17.939999 & 31 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 17.939999–18.199999 & 41 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**18**} & 18.199999–18.459999 & 38 & \(1\sigma\downarrow\) & \multirow{4}{*}{7.980445} & \multirow{4}{*}{1.880986 \(\times\) 10\({}^{-3}\)} & \multirow{4}{*}{28.54648} \\  & 18.459999–18.719999 & 29 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 18.719999–18.980000 & 24 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 18.980000–19.240000 & 16 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**19**} & 19.240000–19.500000 & 9 & \(1\sigma\downarrow\) & \multirow{4}{*}{2.054805} & \multirow{4}{*}{8.570728 \(\times\) 10\({}^{-3}\)} & \multirow{4}{*}{21.08715} \\  & 19.500000–19.759998 & 14 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 19.759998–20.019999 & 11 & \(1\sigma\downarrow\) & & \\ \hline \multirow{4}{*}{**20**} & 20.019999–20.279999 & 9 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 20.279999–20.539999 & 15 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 20.539999–20.799999 & 7 & \(1\sigma\downarrow\) & & \\ \cline{2-5}  & 20.799999–21.059999 & 10 & \(1\sigma\downarrow\) & & \\ \hline \end{tabular}
\end{table}