Major Stats homework help! (10 points for best answer)!?

Suppose time taken to grade an exam-paper by an examiner has mean 12.1 min. and standard deviation 5.8 min. If the examiner has to grade 41 exam-papers, what is the approximate probability that she will finish grading in less than 522 min. (assuming grading times are independent and she grades continuously)? (Answer to 4 decimal places)

I have no idea how to do this so some explanation would be appreciated as well!


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