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The dean has observed for several years and found that the probability distribution of the salary of the alumni's first job after graduation is normal,

The dean has observed for several years and found that the probability distribution of the salary of the alumni's first job after graduation is normal, with a mean of $64k per year and a standard deviation of $4k ( The easiest way is to use empirical rule to come up with the answers):

  1. What's the probability that the alumni get a salary of $72k or more in their first jobs?

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