A random sample of 49 statistics examinations were taken. The average score in the sample was 84 with a variance of 12.

A random sample of 49 statistics examinations were taken. The average score in the sample was 84 with a variance of 12.25. The 95% confidence interval for the average examination score of the population of the examinations is a. 76.00 to 84.00 b. 77.40 to.86.60 c. 83.00 to 85.00 d. 68.00 to 100.00