Dot Plots, Frequency Tables, and Box Plots

The box plot shows the number of houses visited by trick-or-treaters. 50% of the trick-or-treaters visited more than _______ houses.

• 10

• 12

• 18

• 19

Answer explanation

The median splits the data in half (50 / 50).

The box plot shows the number of houses visited by trick-or-treaters. What percent of trick-or-treaters visited less than 19 houses?

• 0%

• 25%

• 75%

• 100%

Answer explanation

19 is the quartile 3. That means that there are 3 chunks of data less than 19, and each chunk represents 25% of the data.

The box plot shows the number of houses visited by trick-or-treaters. What is range of the data?

• 11

• 7

• 21

• 10

Answer explanation

Range = largest value minus the smallest value, the distance from the end of one whisker to the other.

The box plot shows the number of houses visited by trick-or-treaters. What is the interquartile range (IQR) of the data?

• 11

• 7

• 12

• 19

Answer explanation

Interquartile Range = Q3 - Q1 or the length of the whole box.

The table shows the race times for 20 Wydown students. What is the value of x?

• 8

• 3

• 5

• the value of x cannot be determined

Answer explanation

We are told that there are 20 students, so the row of students must add up to 20.

The dot plot shows how much time students spent practicing piano last week. What is the longest amount of time a student practiced?

• 7 hours

• 2 hours

• 8 hours

• 9 hours

The dot plot shows how much time students spent practicing piano last week. What is the mode of the data?

• 2 and 7

• 2

• 7

• 4

The dot plot shows how much time students spent practicing piano last week. How much total time did all of the students practice?

• 13 hours

• 54 hours

• 63 hours

• 28 hours

The dot plot shows how much time students spent practicing piano last week. What is the range of the data?

• 6

• 7

• 4

• 8

The dot plot shows how much time students spent practicing piano last week. What is the median of the data?

• 4

• 2

• 2 and 7

• 6