A random sample of 49 statistics examinations was 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) 80.48 to 87.52.
B) 77.40 to 86.60.
C) 82.99 to 85.01.
D) 68.00 to 100.00.
