Time analysis

[nf227]

I'm looking to take a dataset that shows time to complete a task in seconds and calculate the likelihood that the task is finished in less the 60 seconds. how can i go about this?

here are the data points i have so far

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[#2]

This is really a question for a statistician but the very simple answer would be
=countif(A1:A1000,"<60")/count(A1:A1000)