### Finding Sample Amount for Population Mean

In a study, the carapace lengths (in mm) of Thenus lobster caught near Singapore measured: 78,66,65,63,60,60,58,56,52 and 50 ( the population data is approximately normal). Find: (round to the nearest tenth) a. The sample mean b. The 80% confidence intervals for the population mean= c. The 50% confidence intervals for