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+// Exa 1.6
+//Data taken from Eg 1.4 as stated
+
+clc;
+clear all;
+
+// Given data
+
+x1= 49.7;
+x2= 50.1;
+x3= 50.2;
+x4= 49.6;
+x5= 49.7;
+n= 5; // number of x values
+
+// solution
+
+X_mean= (x1+x2+x3+x4+x5)/5; // Arithmatic Mean
+d1= x1-X_mean;
+d2= x2-X_mean; // deviation from each value
+d3= x3-X_mean;
+d4=x4-X_mean;
+d5=x5-X_mean;
+
+Std_dev= sqrt((d1^2+d2^2+d3^2+d4^2+d5^2)/(n-1));  //Standard deviation 
+printf('The standard deviation = %.2f \n',Std_dev);
+