Please answer it with explnation

A local newspaper reporter is doing a story about NCSU faculty's offcampus consulting. This reporter is specifically interested in how much money faculty members earn from such activities. The reporter obtains a list of all 1533 faculty members of the university and chooses a simple random sample {SR5} of It] faculty members. He mails each of the ten faculty members a survey in which he asks, among other things, how much money each faculty member has earned through offcampus consulting activities during the previous calendar year. All ten faculty members respond to the survey. The data (in dollars] follow. 3- Using an unbiased estimator what is the approximate 95% Confidence interval for the population mean