Posted by Barbara on .
A student score 78 on his statistics test where the average score was 90 the the standard deviation was 7.

Statistics 
PsyDAG,
What is your question? Proportion scoring above? Below? Between score and mean?
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (whatever one you want) related to that Z score.