In this worksheet, we will practice constructing box-and-whisker plots for any data set.

**Q2: **

Which set of data could be represented by the given box-and-whisker plot?

- A80, 80, 78, 72, 76, 71, 76, 76
- B78, 72, 78, 76, 76, 72, 76, 81
- C76, 72, 76, 78, 71, 80, 73, 76
- D72, 72, 78, 80, 78, 76, 76, 76
- E79, 76, 76, 78, 72, 79, 80, 72

**Q3: **

State if the following is true or false: There are more data values in the interval 36–80 than there are in the interval 64–80.

- Atrue
- Bfalse

**Q4: **

The times, rounded to the nearest second, of a group of students running a 400-meter race are represented on the box plot shown.

What was the median time taken?

What was the lower quartile?

What was the longest time taken?

What percentage of students are represented by the times within the box?

- A
- B
- C
- D
- E

Is the median time closer to the lower or upper quartile?

- Alower quartile
- Bupper quartile

What was the overall range of times taken?

What was the interquartile range of times taken?

**Q5: **

The test scores for a physics test are displayed in the following box-and-whisker plot. Determine the percent of students who had scores between 85 and 120.

**Q6: **

Simon has calculated the following information from a data set about the ages of people present on a Saturday morning in a swimming pool:

lowest value: 7

lower quartile: 10

median: 15

upper quartile: 22

highest value: 31

Simon draws a box plot from the data. Which of the following box plots did Simon draw?

- A
- B
- C
- D
- E

**Q7: **

Dalia counted the number of cars that were parked on her road at 8:00 pm on 11 successive days. She presented her data as a list: 3, 8, 12, 6, 5, 6, 7, 9, 4, 10, 8.

She was surprised to find that the minimum number of cars that she counted was 3 and that the maximum number of cars was 12.

Calculate the median number of cars.

Calculate the lower quartile for the number of cars.

Calculate the upper quartile for the number of cars.

Dalia draws a box plot of the data. Which of the following is correct?

- A
- B
- C
- D
- E

**Q8: **

Look at the box-and-whisker plot. Give a reason why the line inside the box is further to the right.

- A The mode is 49.
- B The mean is about 49.
- C The person who made the graph messed up.
- DThe median is closer to Q3 than Q1.

**Q9: **

The box plot shows the daily temperatures at a seaside resort during the month of August.

On roughly what percentage of days was the temperature between and ?

On roughly what percentage of days was the temperature greater than ?

What was the median temperature?

What was the maximum temperature recorded?

What was the minimum temperature recorded?

What was the lower quartile of the temperatures?

What was the upper quartile of the temperatures?

What was the interquartile range of the temperatures?

What was the range of the temperatures?

**Q10: **

Is half of the data in the interval 36–56?

- Ayes
- Bno

**Q11: **

How many summary statistics are represented on a box plot?

- A3
- B4
- C6
- D5
- E7

**Q12: **

What percentage of data values are contained within the box part of a box-and-whisker plot?

**Q13: **

What do the whiskers on a box plot show?

- Athe middle of the data
- Bthe interquartile range
- Cthe variability of the data in the lower quartile only
- Dthe full range of included data
- Ethe variability of the data in the upper quartile only

**Q14: **

Which type of average is represented on a box plot?

- Amean
- Bmode
- Crange
- Dmedian

**Q15: **

Is half the data above 48?

- Ayes
- Bno

**Q16: **

The following box-and-whisker plots show the average daily temperatures in spring and summer. Which of the following describes the variability between the two seasons?

- AThe summer has a smaller MAD and a smaller range than the spring season.
- BThe summer season has a smaller range and a smaller interquartile range than the spring season.
- CThe spring has a larger interquartile range and a larger MAD than the summer season.
- DThe spring has a larger interquartile range; however, the summer has a larger range.