Question 1141745
<pre>
On your TI 83 or 84, 

press 2ND 
press VARS 
highlight 2:normalcdf
press ENTER        

if you have a newer model 84 calculator, make it read this way

         lower:-1 
         upper: 1 
         <font face="symbol">m:0 
                  s:1</font>
         Paste 

Press ENTER

You'll read

normalcdf(-1,1,0,1)  

press ENTER, read 0.6826894809

If you have an older model 84 or an 83, make it read 

normalcdf(-1,1,0,1) 

press ENTER, read 0.6826894809

Edwin</pre>