NORMALD_ICDF (LEFT/CENTER/RIGHT)

[StephanP]

Of course there are ways to work around this, but my colleagues and I kind'a like this from the otherwise quite backward TI-84 Plus CE-T.

Could the function NORMALD_ICDF() be enhanced with an additional optional argument LEFT/CENTER/RIGHT indicating the position of area p?
If not supplied, then option LEFT is assumed standard.

NORMALD_ICDF(185,10,.85,RIGHT)=NORMALD_ICDF(185,10,1-0.85)=174.635...
NORMALD_ICDF(185,10,.85,CENTER)={170.604...; 199.395...}