Question 860202
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Hi,
z-scores tell the tAle as well. Some feel more comfortable using Percentages.
z-scores need not be converted to percentage to compare them: 
done below to give more insight to the Standard Normal Curve.
Percentages given represent area under curve to the left of the z-score
               Score Mean Standard Deviation Z-Score 
 Oral Interpret 38,   40,    10, {{{ highlight_green(-.2)}}} 42%
 Persuasion     28,   20,    20,   0.4   65%
 Theory Building 45,  30 ,    20,  .75   77%
Below:  z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.  
Note: z = 0 (x value the mean) 50% of the area under the curve is to the left and %50 to the right
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, exp(-x^2/2)), green(line(1,0,1,exp(-1^2/2)),line(-1,0,-1,exp(-1^2/2))),green(line(2,0,2,exp(-2^2/2)),line(-2,0,-2,exp(-2^2/2))),green(line(3,0,3,exp(-3^2/2)),line(-3,0,-3,exp(-3^2/2))),green(line( 0,0, 0,exp(0^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}