Question 431006
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Hi
*Note: {{{z = blue(x - mu)/blue(sigma)}}}
 z =(55-50)/10 = 5/10 = .5
 P( x <55) = .6915   69.15% of the scores
Percentage under the graph to the left of the green line: z=.5
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, exp(-x^2/2)), green(line(.5,0,.5,exp(-.5^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}