Posted by lia on Tuesday, November 15, 2011 at 1:17pm.
the times required to assemble a product part are normally distributed with a mean of 54.4 minutes & a standard deviation of 5.2 minutes. What fraction of the assemble workers require more than one hour?

statistics  PsyDAG, Wednesday, November 16, 2011 at 11:39am
Z = (scoremean)/SD
Convert hour into minutes.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.