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Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 42 minutes and standard

Suppose that the amount of time that students spend studying in the library in one sitting is normally distributed with mean 42 minutes and standard deviation 21 minutes. A researcher observed 9 students who entered the library to study. Round all answers to 4 decimal places where possible.

  1. Find the probability that the randomly selected 9 students will have a total study time more than 324 minutes.

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