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+// Exa 2.6

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

+// Given data

+// Value of readings

+x=[147.2 147.4 147.9 148.1 147.7 147.5 147.6 147.4 147.6 147.5] 

+n = 10;// 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 arthmatic mean 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 

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

+// probable error of average of the ten reading 

+e_m = 0.6745 * ( sigma/(sqrt(n-1)) );

+disp(e_m,"The probable error of average of the ten reading is");