MandysNotes

Saturday, 23 January 2010 03:28

invNorm on TI-83

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Command Syntax

invNorm(percentile[,??])

Menu Location

Press:

  1. 2ND DISTR to access the distribution menu
  2. 3 to select invNorm(, or use arrows.


Example: Suppose X represents the scores on an exam and is normally distributed with mean 85 and standard deviation 10.

We want to find the value of x such that 90% of the distribution is below it. This means we are looking for the 90th percentile.


1) Press 2nd DISTR 3. This brings up InvNorm(
2) Type .90 comma 85 comma 10 
3) Press ) button.
4) Press ENTER

The value you get is the 90th percentile for X.

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