it might have a second part but I can't see it yet!

Data on 4900 college graduates show that the mean time required to graduate with a bachelor's degree ls 5.16 years with a standard deviation of 1.67 years. Use a single value to estimate the mean time required to graduate for all college graduates. Also, nd the 95% condence Interval tor the mean tlme required to graduate for all college graduates. The mean time required to graduate for all college graduates ls approximately I] years. {Round to the nearest hundredth as needed.)