plot_tail_ratio: Plot tail ratio
In cyplessen/tailRatio: What the Package Does (One Line, Title Case)

This function plots tail ratios for two normal distributed populations.

plot_tail_ratio(
  area,
  cutoff,
  mean_high,
  sd_high,
  mean_low,
  sd_low,
  x_lab_name,
  mean_of_interest
)

`area`	Area of interest, either "below" or "above" cutoff
`cutoff`	Cutoff value of interest, indicated in standard deviations from the higher mean group
`mean_high`	Mean of group with higher mean
`sd_high`	Standard deviation of group with higher mean
`mean_low`	Mean of group with lower mean
`sd_low`	Standard deviation of group with lower mean
`x_lab_name`	Name for x-Axis
`mean_of_interest`	Reference mean for visualization, i.e. 100 for IQ