To Estimate, with 95% Confidence, the Average Number of Kilometres

To estimate, with 95% confidence, the average number of kilometres that students living off-campus commute to classes every day, a random sample of 20 students was taken and produced a mean equal to 5.2 km and a standard deviation of 3.05 km. In this case, which of the following is the point estimate for the true population mean?

A) 6.63
B) 5.20
C) 3.22
D) 2.15