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+//Example 1.50.c // standard deviation

+clc;

+clear;

+close;

+//given data :

+n=8;

+a=412;

+b=428;

+c=423;

+d=415;

+e=426;

+f=411;

+g=423;

+h=416;

+q=(a+b+c+d+e+f+g+h)/n;

+d1=a-q;

+d2=b-q;

+d3=c-q;

+d4=d-q;

+d5=e-q;

+d6=f-q;

+d7=g-q;

+d8=h-q;

+d=(abs(d1)+abs(d2)+abs(d3)+abs(d4)+abs(d5)+abs(d6)+abs(d7)+abs(d8))/n;

+s=sqrt(((d1^2)+(d2^2)+(d3^2)+(d4^2)+(d5^2)+(d6^2)+(d7^2)+(d8^2))/(n-1));

+disp(s,"the standard deviation(kHz) = ")