The sample standard deviation is 10 what is the probability


"For the following question I can't understand where the 0.086 comes from via the t table. Please advise. The average test score of a population is 75. A sample of 9 students are randomly selected. The sample standard deviation is 10. What is the probability the average score for the sample is above 80?"

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Business Economics: The sample standard deviation is 10 what is the probability
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