When looking at one tail of a distribution, a somewhat-logarithmic view can often make sense. The 90th percentile of a normal distribution lies almost as close

When looking at one tail of a distribution, a somewhat-logarithmic view can often make sense. The 90th percentile of a normal distribution lies almost as close to the mean as it does to the 99th percentile. See also, the UK definition of “middle class” (which isn’t entirely about income, but certainly doesn’t mean “close to median wage”).