- The three basic forms are:
*P*(*Z*<*a*)*P*(*Z*>*a*)*P*(*a*<*Z*<*b*)

- Standard Normal Probability
*P*(*Z*<*a*) - Press
`2nd DISTR`

. The`DISTR`

menu title is highlighted. - Select
`normalcdf`

, item #2, or press 2 and skip the next step. - Press
`ENTER`

. The phrase`normalcdf(`

appears in the display. - Enter
`-5`

(or any negative number beyond`-5`

). - Press comma.
- Enter the value of
*a*. - Press
`)`

. - Press
`ENTER`

. The value of*P*(*Z*<*a*) appears. - Standard Normal Probability
*P*(*Z*>*a*) - Compute
*P*(*Z*<*a*) according to the above instructions. - Subtract the value of
*P*(*Z*<*a*) from`1`

. The result is*P*(*Z*>*a*). - Standard Normal Probability
*P*(a <*Z*<*b*) - Compute
*P*(*Z*<*a*) according to the above instructions. - Compute
*P*(*Z*<*b*) according to the above instructions. - Subtract the value of
*P*(*Z*< a) from*P*(*Z*< b). The result is*P*(*a*<*Z*<*b*).