NORMALD_ICDF (LEFT/CENTER/RIGHT)

[StephanP]

I agree that left/right/center/tail are obvious parameters for normald_icdf()

I checked the TI-84 Plus CE-T (OS version 5.4.0.0034)
- only invNorm() offers the additional tail positioning parameter: left/right/center (no tail/outer)
- The other inverse function invT() does not provide this additional positioning parameter.
Maybe we should leave it at normald_icdf() as well.
   
If you further proceed on this little enhancement, might I ask that abbreviations of these parameters (L/R/C/T) be also allowed, so as to ease entering these values via the command line.
Also, Wes' idea of a Wizard similar to that of the TI-84 does offer students a more fail safe way of entering all parameters in a correct manner.