Posted by Koylar on Sunday, July 20, 2014 at 2:49pm.
A component is rejected if its has a diameter less than 70mm, reworked if the diameter is between 70 and 73.5mm or more than 78.5mm. The diameter of a component is normally distributed with a mean 76mm and standard deviation 2.5mm. In a batch of 400 components, determine the number of components:
(1) that are rejected,
(2) that are accepted

Statistics/Probability  PsyDAG, Monday, July 21, 2014 at 1:25pm
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z scores. Multiply by 400. 
Statistics/Probability  wambua, Thursday, August 7, 2014 at 12:12am
For above question