Always skip a space after < when you post on here,
otherwise the computer will thinks it's an HTML tag
and will delete it. So what you wrote came out
garbled.
For P( lower number < Z < upper number )
If you want P(Z < a), the lower number is -99999999
If you want P(Z > a), the upper number is 99999999.
On your TI-84, press 2ND then VARS then 2. You see this screen
normalcdf
lower: <--put in the lower number
upper: <--put in the upper number
μ: <--put in the mean, which is 0 for standard normal
σ: <--put in the standard deviation, which is 1 for std. normal
Paste <--highlight this and press ENTER
You'll see this on the screen:
normalcdf(1.19,2,0,1) if you wanted this P(1.19 < Z < 2)
Press ENTER and read 0.094273194
Edwin