Question 1162677
E(X)= -13.7, the mean
SE is sigma/sqrt(n)=9/sqrt(72)=1.0607
z<(-14--13.7)/1.0607
<-0.3/1.0607
<-0.28. or -0.2828
probability is 0.3897
z for -13 is (0.7/1.0607)=0.6600

probability of z between -0.28 and 0.66 is 0.3567