The accuracy of a measurement may be expressed as the per cent error. Each set of analytical results should be accompanied by an indication of the precision of the analysis. Precision may be indicated by average deviation, standard deviation, and relative standard deviation.

Two students working in a group, Adama Simplico and Uso Salviati, experimentally obtained the following values for the atomic weight of bromine: $79\mathrm{.}914,79\mathrm{.}794,79\mathrm{.}910,79\mathrm{.}920,79\mathrm{.}918,79\mathrm{.}922,$ and $79\mathrm{.}908a.$ Adama knew not what to do with this data, so Uso helped him treat the data by first arranging it in tabular form, as in the lab manual on p$.1($E$)-4.$

a$.$ What did Uso find for the: median value, mean value, average deviation, standard deviation, relative standard deviation, and the per cent error of the mean value?

b$.$ Adama needed to use the $Q$ test to evaluate whether his one experimental value, $79\mathrm{.}794a,$ should be included in the data set. Should this value be retained or rejected?