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+// Exa 2.5

+format('v',7);clc;clear;close;

+// Given data

+// Reported values for average petrol consumption

+x= [25.5 30.3 31.1 29.6 32.4 39.4 28.9 30.0 33.3 31.4 29.5 30.5 31.7 33.0 29.2];

+n = 15;// number of reading

+sigma_x=0;// initialization of variable

+for i=1:1:15

+    sigma_x= sigma_x+x(i);// sum of reading

+end

+Mean =sigma_x/n;// mean value

+disp(Mean,"The mean value is");

+sorted_x= gsort(x);

+Xmedian = sorted_x((n+1)/2);// median value

+disp(Xmedian,"The median value is");

+sigma_d_sq=0;

+for i=1:1:15

+    d(i)=x(i)-Mean

+    sigma_d_sq= sigma_d_sq+d(i)*d(i);

+end

+sigma = round(sqrt( sigma_d_sq/(n-1) ));// standard deviation

+disp(sigma,"The standard deviation is");

+V = sigma^2;// variance

+disp(V,"The variance is");