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diff --git a/2294/CH12/EX12.13/EX12_13.sce b/2294/CH12/EX12.13/EX12_13.sce
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+//Example 12.13
+//Find the required probabilities.
+disp('P(X>0.6)=1-F(0.6)=')
+disp(%e^(-1.2),'1-(1-e^(-1.2))=e^(-1.2)=')
+disp(1-%e^(-0.5),'P(X<=0.25)=(1-e^(2*(-1.2))=1-e^(-0.5)=')
+disp('P(0.4<X<=0.8)=F(0.8)-F(0.4)=')
+disp((1-%e^(-1.6))-(1-%e^(-0.8)),'(1-e^(-1.6))-(1-e^(-0.8))=')
+