Thirty randomly selected students took the calculus final. If the sample mean score was 82 and the standard devia was 10.4, find the 99% confidence interval for the mean score of all students. Assume the population is normally distributed and round to two decimal places. O A. 77.33 to 86.68 O B. 76.77 to 87.23 O C. 76.79 to 87.21 D. 78.77 to 85.23

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