Question: How to do integration which consists of a list?

Dear friends,

 

I am trying to do an integration which consists of a list of data; let me explain it more:

I have to do

however, I do not have f(x) in the form of a function. f(x) is a list which is:

also, I have x as

How can I do the integration between 1<x<6 ?

 

 

 

 

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