Question 1159795
<pre>
a. In a group of 230 tests, how many students score above 96? 


On your TI-84, 2ND VARS

normalcdf(96,1E99,76,10)  <-- the "E" to use is 2ND then the comma key

0.022759962

multiply by 230

5.232514263

Round down to 5 students.

-------------------------

b. In a group of 230 tests, how many students score below 66? 

normalcdf(-1E99,66,76,10)

0.1586552596

multiply by 230

36.4907097

Round down to 36 students.

--------------------------

c. In a group of 230 tests, how many students score within one standard deviation of the mean? 

That's between 76-10=66 and 76+10=86

normalcdf(66,86,76,10)

0.682689809

multiply by 230


157.0185806

Round down to 157 students.


Edwin</pre>