In the state of California, all graduating PR seniors must take a comprehensive exam (100 points max.

In the state of California, all graduating PR seniors must take a comprehensive exam (100 points max.) Past data show that their exam scores are approximately normally distributed with the MEAN of 60 and the Standard Deviation of 15.

What is a 95% confidence interval estimate of the average score for all PR students if the average score of 36 randomly selected students was 67?