Question 1180807
z(35)>(35-45.5)/3.92=-2.68.  Probability is 0.9963 or 99.63%
-
over 50 is z>(50-45.5)/3.92 or 1.148. Probability is 0.1255 or 12.55%
-
over 55  is z>(55-45.5)/3.92 or 2.423. Probability is 0.0077 or 0.77%