The difference (in self-reported subjective happiness rating 1–10 too) is not as significant as the graphic implies visually
Ah here is another one. So what? It makes the difference more distinguishable, which also the graph denotes numerically. Otherwise all Linux distros users would appear too flat to make any difference interpretable.
The fact that there are at least two such comments around here shows why teaching anything in schools is doomed to fail.
Even critical thinking skills are applied in a canned, thought-terminating fashion, similar to how XX/XY chromosomes are considered the only reality, in overconfident falsehood.