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he amount of time it takes an Intro to Statistics instructor to grade an individual test is a random
variable with expected value 3 minutes and standard deviation 1 minute. She has 64 test to grade
and begins grading at 7:40 PM.
Question 1. What is the probability that she is finished grading by the beginning of the 11:00 PM
news? .
Question 2. What is the probability that she is finished grading by the beginning of the 11:10 PM
sports report?

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