Suppose that there are 20 numbers in a data set and that they are all different.

1. How many of the values in this data set are between the first quartile and the third quartile?
2. How many of the values in this data set are between the first quartile and the median?

In a word game, 1 letter is worth 1 point. This dot plot shows the scores for 20 common words.

1. What is the median score?
2. What is the first quartile (Q1)?
3. What is the third quartile (Q3)?
4. What is the interquartile range (IQR)?

Mai and Priya each bowl 10 games and record the scores. Mai’s median score is 120, and her IQR is 5. Priya’s median score is 118, and her IQR is 15. Whose scores probably have less variability? Explain how you know.

Each student in a class recorded how many books they read during the summer. Here is a box plot that summarizes their data.

1. What is the greatest number of books read by a student in this group?
2. What is the median number of books read by the students?
3. What is the interquartile range (IQR)?

The data shows the number of hours per week that each of 13 seventh-grade students spent doing homework. Create a box plot to summarize the data.

• 3
• 10
• 12
• 4
• 7
• 9
• 5
• 5
• 11
• 11
• 5
• 12
• 11

Below is a set of data about temperatures. The range of a set of data is the distance between the lowest and highest value in the set. What is the range of these temperatures?

• \(9^\circ \text{C}\)
• \(\text-3^\circ \text{C}\)
• \(22^\circ \text{C}\)
• \(\text-5^\circ \text{C}\)
• \(11^\circ \text{C}\)
• \(15^\circ \text{C}\)

The price of a pair of earrings is $22 but Priya buys them on sale for $13.20.

1. By how much was the price discounted?
2. What was the percentage of the discount?