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diff --git a/659/CH5/EX5.1cs/Casestudy1.sce b/659/CH5/EX5.1cs/Casestudy1.sce
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+//                Case Study:-Chapter 5, Page No:139
+//                 1.Range of numbers
+
+sum1=0;
+count=0;
+f=0;value=1;
+printf("Enter numbers[press enter after each number]:\n input a NEGATIVE number to end\n");
+while(value)
+    [value]=scanf("%f");  //Read data
+    if(value<0) then
+        break;
+    end
+    count=count+1;
+    //Calculating height and lowest value
+    if(count==1) then
+        high=value;
+        low=value;
+     elseif(value>high) then
+         high=value;
+     elseif(value<low) then
+         low=value;
+     end
+     //Calculate sum
+     sum1=sum1+value; 
+end
+average=sum1/count;     //Average cost
+range1=high-low;        //Range of values
+//Print the results
+printf("Total values: %d\n",count);
+printf("Highest-values: %f\nLowest-value: %f\n",high,low);
+printf("Range: %f\n Avarage: %f\n",range1,average);
diff --git a/659/CH5/EX5.1cs/Casestudy1_output.PNG b/659/CH5/EX5.1cs/Casestudy1_output.PNG
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+++ b/659/CH5/EX5.1cs/Casestudy1_output.PNG