Posted by Pacifico on Friday, March 19, 2010 at 3:53pm.
Without that site, you can still figure it out.
Z = (x - mean)/standard deviation
In the back of your text, there is a table labeled something like "areas under normal distribution." Find that percentage in the table to determine your Z score. Put the values in the above equation and solve.
I hope this helps a little more.
Thank you for your help bobpursley and PsyDAG.
I believe the answer is 2.8 minutes. However, the wording of the question using 'exceed' is confusing to me. How do you confirm it is indeed 2.8 minutes and not 4.2 minutes.
Thanks again.
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