Question: Five laboratory mice with thymus leukemia are observed for a predetermined period of 500 days. After 450 days, three mice have died, and one of the remaining mice is sacrificed for analysis. By the end of the observational period, the last remaining mouse still survives. The recorded survival times for the five mice are
222 421 378 450* 500*
where * indicates that the mouse survived for at least the given number of days but the exact value of the observation is unknown.
a. Can you find the sample mean for the data set? If so, find it. If not, explain why not.
b. Can you find the sample median for the data set? If so, find it. If not, explain why not.