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+// Exa 2.21
+format('v',7);clc;clear;close;
+// Given data
+x= [29.6 32.4 39.4 28.9 30.0 33.3 31.4 29.5 30.5 31.7 33.0 29.2];// measured value
+n = 12;// number of reading
+sigma_x= 0;// initialization of variable
+for i=1:1:n
+    sigma_x= sigma_x+x(i);// sum of readings
+end
+x_bar=sigma_x/n;// mean value 
+disp(x_bar,"The mean value is");
+sorted_x= gsort(x);
+x_median= (sorted_x(n/2)+sorted_x(n/2+1))/2;// median value
+disp(x_median,"The median value is : ")
+sigma_d_sq=0;
+for i=1:1:n
+    d(i)=x(i)-x_bar
+    sigma_d_sq= sigma_d_sq+d(i)*d(i);
+end
+sigma = sqrt( sigma_d_sq/(n-1) );//standard deviation in V
+disp(sigma,"The standard deviation in V is");
+