Question 820938
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
 1. z = (12.2-9)/2 = 3.2/2 = 1.6
  P(x <12.2min) = P(z< 1.6) = 94.52%
2. z = (7.8-9)/2 = -1.2/2 = -.6
 P(x >7.8min) = P(z > .6) = 72.57%