Question 1091848
a.  z=(x-mean)/sigma or (29-38.7)/7.3 or -9.7/7.3=-1.33; probability is z < -1.33 or 9.18%
b. z for 36 minutes is (36-38.7)/7.3 or -2.7/7.3 or -0.37.  Want z in between -1.33 and -0.37.  This is 26.39%
c.z for 44 minutes is (44-38.7)/7.3=5.3/73 or +0.73.  Want z between -1.33 and +0.73.  This is 67.55%