avg = 0;
var = 4;
num = 9;
X =[5 8.5 12 15 7 9 7.5 6.5 10.5];
samplemean= mean(X);
lowerlim = samplemean - (1.96*sqrt(var/num))
upperlim = samplemean + (1.96*sqrt(var/num))

disp(upperlim, "to ",lowerlim,"The 95% confidence interval is ",   )