Estimating the mean life time using right censored data

Estimation of the population mean based on right censored observations is considered. The naive sample mean will be an inconsistent and asymptotically biased estimator in this case. An estimate suggested in textbooks is to compute the area under a Kaplan-Meier curve. In this note, two more seemingly different approaches are introduced. Students' reaction to these approaches was very positive in an introductory survival analysis course the author recently taught.