Question

Stem-and-Leaf Plots

Answer 1

In total, there are 3 swimmers that are younger than 30.

Answer 2

We are looking for any swimmer's whose age begins with a 0, 1 or 2.

We look at the tree and count one swimmer (age 11) beginning with a 1 and two swimmers (age 23 and 29) beginning with a two.

In total, there are three swimmers younger than 30.