Question: The average grade in a statistics course has been '15 with a standard deviation of 9. Ifa random sample of 63 is selected from this

The average grade in a statistics course has been '15 with a standard deviation of 9. Ifa random sample of 63 is selected from this population, what is the probability that the average grade is more than 7'8? Use appendix EU for the zvalues. (Round your z-value 1a 2 decimal places and the nal answer to 4 decimal places.) Probability |:|

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