What are the ideal video statistics?

Hi guys, I was wondering what standards you should be aiming for when posting a video. Should you aim for a average retention of over 50% or viewed to end percentage. Which metrics are Important and how much should you try and reach for a video to start to go viral.

Well honestly for average percentage viewed on a video over 5 minutes long what I see from my stats is very weird, since some videos have like 70%, some have like 30%. Just goes off to show me how the video was or how did people enjoy it. But I'd say anything over 45% is good, since there are always those who click off before even watching the first 10 seconds.

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Number of views must be over 5 minutes.