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run the cron job at a set time, but have the code that it runs, php or other hand the randomization. A simple example would be to have it generate a random number between 1 and 10 and if the number if 7 then run execute the rest of the job, if not exit.... then it'll try it again next time the cron job runs. You'd be bound to have it be 7 now and then.
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