An investigator monitors the thermal decomposition of sodium hydrogencarbonate powder in an open crucible. The decrease in mass of the crucible and its contents is recorded after heating, due to the release of carbon dioxide gas and water vapour. The experiment is performed four times under identical conditions, yielding the following mass losses:
Determine the range of the four recorded mass losses.
Calculate the mean mass loss, ensuring you identify and exclude the anomalous result from your calculation.