Posted by Rhi on .
A manufacturer knows that their items have a normally distributed length, with a mean of 7.3 inches, and standard deviation of 0.6 inches.
If one item is chosen at random, what is the probability that it is less than 5.5 inches long?

statistics 
PsyDAG,
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/percentage related to the Z score.