Question 1161980
<pre>

On your TI-84,

press 2nd vars 2

lower:1.6             
upper:2.0
&mu;:1.89
&sigma;:0.63/√(25)         <--for √( press 2nd then x² 
Paste                 <--scroll down with down arrow key to highlight Paste

press enter

normalcdf(1.6,2.0,1.89,0.63/√(25)

press enter

0.7979936308          <--answer

Edwin</pre>