Find the confidence interval specified. Assume that the population is normally distributed. A sociologist develops a test to measure attitudes about public transportation, and 27 randomly selected subjects are given the test. Their mean score is 76.2 and their standard deviation is 21.4. Construct the 95% confidence interval for the mean score of all such subjects.

64.2 to 88.2

69.2 to 83.2

67.7 to 84.7

74.6 to 77.8