Question 629193
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Hi,
mean of 80 and a standard deviation of 10
*Note: {{{z = blue(x - mu)/blue(sigma)}}} in this case z = (70-80)/10
 P(x &#8805; 70) = 1 - P(z = -1) = 1 -  NORMSDIST(-1) =  1 - .1587 = .8413  0r 84.13%
Note:  One may use a table, calculator or Excel function to find P(z= -1)
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, 0,exp(-x^2/2)), blue(line( -1,0, -1,exp(-1^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}