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+//===========================================================================
+//chapter 3 example 21
+clc;clear all;
+
+//variable declaration
+x1   = 49.7;      //voltage in V
+x2   = 50.1;      //voltage in V
+x3   = 50.2;      //voltage in V
+x4   = 49.6;      //voltage in V
+x5   = 49.7;      //voltage in V
+n     =5;
+
+//ccalculations
+x   =(x1+x2+x3+x4+x5)/(5);    //arthimetic mean
+d1   =x-x1;       //deviation
+d2   =x-x2;       //deviation
+d3   =x-x3;       //deviation
+d4   =x-x4;       //deviation
+d5   =x-x5;       //deviation
+d     = (d1**2)+(d2**2)+(d3**2)+(d4**2)+(d5**2);
+sigma  = sqrt(d/(n-1));       //standard devation 
+
+//result
+mprintf("arthimetic mean = %3.2f ",x);
+mprintf("\nstandard deviation = %3.3f",sigma);
+
+
+