A recent study of 33 Jackson County, Missouri residents revealed that they had lived at their current

Question:

A recent study of 33 Jackson County, Missouri residents revealed that they had lived at their current address for a mean of 10.7 years, with a sample standard deviation of 3 years.
What is the population mean?
What is the best estimate of the population mean?
What is the standard error of the mean?
Develop a 90% confidence interval for the population mean.