How to build a graph based on this data?

Question

excel

Here is the data https://yadi.sk/i/QAa86xfi8C7oBQ
In the first column, the duration of the session on the site in seconds.
In the 4th column - conversion as a percentage.
How to build a graph that would show at what session durations the greatest conversion?
I get some kind of game, not a graph from which nothing is clear.
If this can be done somehow, then, for example, you can group the duration into groups of 10 seconds.