Question 742883
a. P(X < 20) = {{{P(Z < (20 - 30)/8)}}}
             = P(Z < -1.25)
             = 10.56%
b. P(X > 35) = {{{P(Z > (35 - 30)/8)}}}
             = P(Z > 0.625)
             = 26.60%
c. P(25 < X < 35) = {{{P((25-30)/8 < X < (35-30)/8)}}}
                  = P(-0.625 < Z < 0.625)
                  = 1 - 2(0.2660)
                  = 46.8%
  Answer: 46.8% of 200 =  93.6 &#8776; {{{highlight(94)}}} students