(a) Construct a stem-and-leaf diagram to illustrate the data.
(b) Use your diagram to find the median of the data.
Solution
(i) The graph is misleading because it uses a false zero, starting the y-axis at 4980 instead of 0, exaggerating the increase in sales.
(ii)(a) To construct a stem-and-leaf diagram, separate each number into a 'stem' (all but the last digit) and a 'leaf' (the last digit). Sort the numbers: