This should get you started. You'll likely need to change the eval expression to whatever indicates a closed ticket.
<your base search for all tickets> | stats count(eval(status=Closed)) as closed, count as total | eval "Percentage Closed"=(closed*100)/total | rename closed as "Tickets Closed", total as "Total Tickets" | table "Tickets Closed" "Total Tickets" "Percentage Closed"
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