Stem-and-Leaf Plots

1. A statistician for a chain of department stores created the following stem-and-leaf plot showing the number of pairs of glasses at each of the stores:

\( \begin{array}{|l|lllllll}

0 & 9 & & & & & \\

1 & 3 & 6 & 6 & 8 & & \\

2 & 1 & 2 & 3 & 5 & 6 & 9 \\

3 & 0 & & & & & \\

4 & 1 & 2 & 3 & 3 & 5 & 7

\end{array} \)

Key: \(4 \mid 1=41\) pairs of glasses

How many department stores have fewer than 38 pairs of glasses?

______ department stores

2. A zookeeper published the following stem-and-leaf plot showing the number of bears at each major zoo in the country:

\(

\begin{array}{|l|llllll}

0 & & & & & & \\

1 & 8 & 8 & & & & \\

2 & 1 & 3 & 6 & 6 & 7 & 7 \\

3 & 1 & 7 & & & & \\

4 & 1 & 4 & 5 & 7 & & \\

5 & 0 & 3 & & & &

\end{array}

\)

Key: \(4 \mid 1=41\) bears

How many zoos have exactly 16 bears?

_____ zoos

3. A zookeeper published the following stem-and-leaf plot showing the number of lizards at each major zoo in the country:

\(

\begin{aligned}

&\left|\begin{array}{c|ccccc}

0 \\

1 \\

2 & 0 & 6 & 8 & 8 & 8 \\

3 & 0 & 2 & 6 & 6 & 7 \\

4 & 1 & 2 & 6 & 6 & \\

5 & & & & & \\

6

\end{array}\right| \\

&\text { Key: } 4 \mid 1=41 \text { lizards }

\end{aligned}

\)

What was the smallest number of lizards at any one zoo?

_____ lizards

4. The regional manager of a chain of department stores created the following stem-and-leaf plot showing the number of pairs of boots at each of the stores:

\(

\begin{array}{l|lll}

0 & & & \\

1 & 7 & 8 & \\

2 & 0 & 5 & 8 \\

3 & 4 & 4 & 7 \\

4 & 0 & & \\

5 & & & \\

6 & & &

\end{array}

\)

Key: \(1 \mid 7=17\) pairs of boots

How many department stores have more than 60 pairs of boots?

_____ department stores