Question 1161797
z=(x-mean)/sd
a.  z is more than 6/12 or 1/2.That probability is 0.3085
b.  z is between -1.5 and +0.75 with probability of 0.7066
c. z is less than -0.5, and since the curve is symmetrical, that is the same answer as a or 0.3085 probability 
d. z is less than -2.25 or 0.0122. Uncommon but given the number of babies born is uncommon for sure.