I am stuck with this may be a simple proces how to use the theme_bw as this command line shows grey background color on plot and also how to increase the font size as I a first time on R
bar + stat_summary(fun.y = "mean", geom = "bar", fill = "white", colour = "black") + stat_summary(fun.data = "mean_cl_normal", geom = "errorbar", colour = "black", width = 0.1) + labs(x = "Job", y = "Mean number of friends"))
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