1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Statistic student return and forgot it all

  1. Sep 17, 2006 #1
    I studied stat couple years ago, and going back again...here goes...

    THe time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes.

    Assume that the class has students and that the examination period is 90 mintues in length. How many students do you expect will be unable to complete the exam in the allotted time?

    so, i know mean is 80 and SD is 10, and the z is 90...am i find the "n" in the case?? How do i find it? by using what formula??o:)
     
  2. jcsd
  3. Sep 18, 2006 #2
    I think you have to find out what percent of the normal distribution is beyond one standard deviation. Then, multiply that percentage by the amount of students taking the test and you should have your answer.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Statistic student return and forgot it all
  1. Statistics for a $ (Replies: 1)

Loading...