Use the given degree of confidence and sample data to construct a confidence interval for the population mean . Assume that the population has a normal distribution. Thirty randomly selected students took the calculus final. If the sample mean was 90 and the standard deviation was 9.0, construct a 99 percent confidence interval for the mean score of all students. O (85.47, 94.53) O (85.95, 94.05) (85.49, 94.51) (87.21.92.79)