Question: how do i plot a smooth curve and extend it

the point given as follows:

x=[3,4,5,6,7]...

y=[7.42494922444550, 3.67768248674133, 2.52235142453921, 1.95610223891559, 1.61770309810016]

 

I have plotted the point and the output is like this:

plot_output.docx

how to smooth the curve and extend the curve longer 

 

please help me.....

 

 

 

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