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diff --git a/542/CH1/EX1.1/Example_1_1.sce b/542/CH1/EX1.1/Example_1_1.sce
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+++ b/542/CH1/EX1.1/Example_1_1.sce
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+clear; 
+clc;
+printf("\n Example 1.1");
+//Given size analysis of a powdered material
+d=[1,101];//diameter of the powdered particles
+x=[0,1];//mass fractions of the particles
+plot2d(d,x,style=2,rect=[0,0,120,1])
+xtitle("size analysis of powder","particle size(um)","mass fraction(x)")
+d=100*x+1; // from the given plot
+//calculation of surface mean diameter
+function[ds]=surface_mean_diameter(x0,x1)
+    ds=1/(integrate('1/(100*x+1)','x',x0,x1))
+    funcprot(0)
+endfunction
+ds=surface_mean_diameter(0,1);//deduced surface mean diameter according to def.
+printf("\n The surface mean diameter is %fum",ds);
+
+ 
+\ No newline at end of file