Answer:
a. stem-and-leaf display.
Step-by-step explanation:
A stem and leaf display is a type of graphical methos that involved using a table to show a stem and then leafs to that stem that provide both the rank and shape of a distribution of data simultaneouly, for example you have the next table:
Steam Leaf
30 11, 34, 23
40 12,40,23
50 11,24,36
So the stem is the first number to show and the leaf are the complementaries than can happen: 3011, 3035, 3023, 4012,4040, 4023, 5011,5024, 5036, and like that is how you use a stem and leaf display.