Question 430251
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
Survey Results reveal that 45% of patients screened for a virus test positive
 p = .45  q = .55 
random sample of 35 patients
mean = .45*35 = 16 expected average number to test positive..
SD = sqrt(38*.55*.45) = ~3
P(between 13  and 19) = P (-1 > z <1) 1 SD from mean accounts  for 68.2% 
{{{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(-1.0^2/2))),green(line(1,0,1,exp(-1.0^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}