# Worksheet: Stem-and-Leaf Plots

In this worksheet, we will practice using a stem-and-leaf plot to organize data sets.

**Q2: **

The stem-and-leaf plot shows the ages of people at a birthday party.

Stem | Leaf | ||||
---|---|---|---|---|---|

1 | 0 | 3 | 6 | ||

2 | 1 | 6 | 7 | 8 | |

3 | 5 | 5 | 6 | ||

4 | 1 | 1 | 5 | 6 | 9 |

5 | 0 | 3 | 6 | 8 |

How many people attended the birthday party?

**Q6: **

A class of students were asked to count and record the number of bugs they could find in their yards in 30 minutes. The results were as follows:

Write the stems, in ascending order, of a stem-and-leaf plot for the data.

- A
- B
- C
- D
- E

Display the data in a stem-and-leaf plot.

- A
- B
- C
- D
- E

Use your stem-and-leaf plot to find out how many students counted bugs in their yards.

**Q7: **

Write the stems, in ascending order, for the following data set and, hence, make a stem-and-leaf plot from the data: .

- A
- B
- C
- D
- E

**Q8: **

Write the stems, in ascending order, of a stem-and-leaf plot for the following data set: 67, 81, 74, 10, and 36. Then, complete the stem-and-leaf plot.

- AThe stems are 1, 3, 6, 7, and 8.
- BThe stems are 1, 3, 6, 7, and 8.
- CThe stems are 1, 3, 6, 7, and 8.
- DThe stems are 1, 3, 6, 7, and 8.

**Q9: **

A survey was done to collect data on the number of hours per month that students in a class spent doing three activities: (1) playing computer games, (2) watching TV, and (3) playing sports. The data was put into three stem-and-leaf plots, as shown below.

How many students played computer games for more than 60 hours a month?

What were the greatest and the least number of hours a student played sports for?

- ALeast: 4 hours per month, greatest: 50 hours per month
- BLeast: 0 hours per month, greatest: 60 hours per month
- CLeast: 4 hours per month, greatest: 60 hours per month
- DLeast: 0 hours per month, greatest: 50 hours per month

Comparing the stem-and-leaf diagrams for computer games and watching TV, what can you say about the number of hours students spent on these two activities?

- AVery few students played computer games for less than 50 hours per month, and the vast majority played for more than 30 hours. Most students watched TV for less than 30 hours per month.
- BVery few students played computer games for less than 70 hours per month, and the vast majority played for more than 100 hours. Most students watched TV for less than 30 hours per month.
- CVery few students played computer games for less than 30 hours per month, and the vast majority played for more than 50 hours. Most students watched TV for less than 30 hours per month.
- DVery few students played computer games for less than 40 hours per month, and the vast majority played for more than 20 hours. Most students watched TV for less than 30 hours per month.

**Q10: **

The monthly rainfall was measured (in inches) in Minneapolis, MN, over 1 year with the following results.

January | February | March | April | May | June | July | August | September | October | November | December |
---|---|---|---|---|---|---|---|---|---|---|---|

0.9 | 0.8 | 1.9 | 2.7 | 3.4 | 4.3 | 4 | 4.3 | 3.1 | 2.4 | 1.8 | 1.2 |

Illustrate the rainfall data in a stem-and-leaf plot.

- A
- B
- C
- D
- E