Question 430290
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
 p(7) = 1/5 = .2  q = .8
900 draws
mean = .2*900 = 180 7's expected
SD = sqrt(900*.55*.45) = 12
P(more than 160 7's) that is somewhat less than everything to the right of z = -2, 
or (P = 98%)which would be P(more than 156 7's)
Estimate would be somewhat less than the .98 or 98%.
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, exp(-x^2/2)), green(line(-2,0,-2,exp(-2.0^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}