Computing Standard Normal Percentiles
Z is the standard normal random variable.
- Find c such that P(Z < c) = p.
2nd DISTR. The
DISTR menu title is highlighted.
invNorm, item #3, or press 3 and skip the next step.
ENTER. The phrase
invNorm( appears in the display.
- Enter the value of p. This number must be between 0 and 1.
ENTER. The value of c appears in the display.
- Find c such that P(Z > c) = p.
- Compute 1 − p.
- Use the above procedure to find c such that P(Z < c) = 1 − p.