Data on 4200 college graduates show that the mean time required to graduate with a? bachelor's degree is 5.15 years with a standard deviation of1.69 years. Use a single value to estimate the mean time required to graduate for all college graduates.? Also, find the? 95% confidence interval for the mean time required to graduate for all college graduates.
The mean time required to graduate for all college graduates is approximately ________years.
?(Round to the nearest hundredth as? needed.)