Hi I would like to know how can I get the mean of my data that has left censored:

+----------------------+ | var1 conc censor | |----------------------| 1. | 120 120 0 | 2. | 0 0 0 | 3. | <42 42 1 | 4. | 198 198 0 | 5. | 75 75 0 | +----------------------+