Could I plot data from other papers in my figures for comparison? It's necessary for my current paper to compare some values from my work and previous work. Since the mean and std values of previous work are shown in their paper, could I plot some bar chart for the comparison between mine and theirs(of course I'll specify the source of the data)?
Yes, you can do this. Note that data per se isn't copyrightable in most places. But citation is proper to avoid any charge of plagiarism.