us e the formula z=x-u/SD to determine the z score for a score of 34.5 a normal distribution if the mean is 46.5 and the standard deviation is 8.7
http://davidmlane.com/hyperstat/z_table.html
careful about parentheses
z= (x-u)/SD
= (34.5 -46.5) /8.7
= - 1.38