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For all sixth-grade students in the U.S, the distribution of writing proficiency scores is normally shaped with a mean of 85 and a standard deviation

For all sixth-grade students in the U.S, the distribution of writing proficiency scores is normally shaped with a mean of 85 and a standard deviation of 10.9. A sample of 43 students from that population have an average writing proficiency score of 80. What is zobt for the sample mean of 80? What is the probability of obtaining that sample, or one with a mean more extreme?

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