ArthurB comments on Shut Up And Guess - Less Wrong
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On this page, the cumulative refers to the probability of obtaining at most p successes. You want to run it with 30 and 9 which gives you the right answer, 2.14%
Or you could put in 30 and 20 which gives you the complement.
What is lower than 1% is the probability of getting 8 or less right answers.
Oh, I see how they did that. Thanks. Original post edited.