Posted by badel on Thursday, November 18, 2010 at 11:50pm.
The average time a student spends studying just prior to a test is 36 minutes with a standard deviation of 5 minutes. This distribution approximates a normal curve. Find the percent of students who study just prior to the test for. a) more than 40 minutes b) between 35 and 45 minutes

Stat  Brandon, Friday, November 19, 2010 at 2:44am
ncdf(40,1000,36,5)=.212 a)
ncdf(35,45,36,5)=.543 b)
its been a while so im not 100% sure if its right but i think it is :)
dont forget to draw the normal curves on your assignment my teachers alwyas made me haha

statistics  PsyDAG, Friday, November 19, 2010 at 10:32am
Z = (scoremean)/SD
Calculate the various Z scores.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to these Z scores
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