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+//caption:find arithmetic mean,standard deviation and probable error of onereading
+//Ex2.15
+clc
+clear
+close
+x1=30.30//level of liquid(in mm)
+x2=30.25//level of liquid(in mm)
+x3=30.40//level of liquid(in mm)
+x4=30.00//level of liquid(in mm)
+n=4//numberof readings
+x=(x1+x2+x3+x4)/n
+disp(x,'arithmatic mean(in mm)=')
+d1=x1-x
+d2=x2-x
+d3=x3-x
+d4=x4-x
+S=((d1^2+d2^2+d3^2+d4^2)/(n-1))^0.5
+disp(S,'standard deviation(in mm)=')
+P=0.6745*S
+disp(P,'probable error(in mm)=')
+\ No newline at end of file