Which one is the correct average value for Click Through Rate (CTR)?

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CTR is defined as Clicks / Impressions. I want to calculate average CTR of the given data. If I use Average function on CTR it gives me average of 0.16%. If I use Total Clicks / Total Impressions I get average of 0.21%. Which one should I consider as the correct one?

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@shasoni619 

The second one =SUM(B2:B8)/SUM(A2:A8).