Exercise 1 Page 493

We want to make a stem-and-leaf plot of the given number of hats sold each day.

Hats Sold Each Day
$5$	$18$	$12$	$15$
$21$	$30$	$8$	$12$
$13$	$9$	$14$	$25$

The first step is to order the data from least to greatest. Remember that on a stem-and-leaf plot, each data value is broken into a stem and a leaf, where the digit on the left is the stem and the digit on the right is the leaf. Because our data values range from $5$ to $30,$ we will use tens digits for the $\text{stems}$ and the ones digits for the $\text{leaves}.$ For numbers with one digit, the stem will be $0.$ We will write the $\text{stems}$ to the left of the vertical line and the $\text{leaves}$ for each stem to the right of the vertical line. Remember that if there is a repeated number, it will appear on the plot the number of times it is repeated. This is the stem-leaf plot of the hats sold each day.