I am having the hardest time grasping Confidence Intervals. I have several problems but I don't even understand the concept. Could be please break down how you got the answer.

The following data set represents the number of cars passing through an intersection between 4:30 and 5:30 p.m. for a random sample of 10 weekdays.

1207 1315 1005 1192 1108 1252 1179 1231 1098 1153

Calculate a 95% confidence interval for the population mean assuming the population of approximately normally distributed.

a. (116.5, 1231.5)

b. (1111, 1237)

c. (1001.4, 1346.6)

d. (974.8, 1373.2)