In their book Introduction to Linear Regression Analysis (3rd edition, Wiley, 2001) Montgomery, Peck, and Vining present measurements on NbOCl3 concentration from a tube-flow reactor experiment. The data, in grammole per liter  103, are as follows:

450 450 473 507 457 452 453 1215 1256 1145 1085 1066 1111 1364 1254 1396 1575 1617 1733 2753 3186 3227 3469 1911 2588 2635 2725

(a) Construct a stem-and-leaf diagram for this data and comment on any important features that you notice.

(b) Compute the sample mean, sample standard deviation, and the sample median.