Hint for smoker data set on salmon colored sheet

For the three data sets where you are trying to find x-bar and sx, here are the values of sigmax. If your calculator has a different value for sigmax, you need to check the data list to make sure you haven't made a mistake. The size of each of the data sets is n = 40. Round your answers to two places after the decimal.

Smokers: sigmax = 117.9951244
Exposed non-smokers: sigmax = 136.3469632
Non-exposed non-smokers: sigmax = 61.74688251