INTERPRETING DOT PLOTS WORKSHEET

Problem 1 :

At recess time the sales of drinks were recorded over a three minute period.

O = 100 plus, S = soy milk, C = cola, I = iced tea.

The data was : OSSCI  OCISO IOCSO OOOSC SOCOS SOOCO OIOIS

a) Draw a dot plot of the data

b) What is the mode?

Solution

Problem 2 :

The dot plot shows shoe sizes for students in grade 6.

a) How many students are in grade 6 at this school?

b) How many have shoe size 9 or more?

c) what percentage have shoe sizes 8 or more? 

Solution

Problem 3 :

The dot plot shows the numbers of students playing various instruments in the school orchestra.

a) How many play stringed instruments?

b) How many students are in the orchestra?

c) Find the mode of the data.

Solution

Problem 4 :

A class of students at a school in England were asked which summer sport they wanted to play. The choices were : T = tennis, S = swimming, C = cricket, B = basketball and F = football.

The data was : FFCTC  CSFST  TTBFS  FFCSF  TFTBC

a) Draw a horizontal dot plot of the data.

b) Find the mode of the data.

Solution

Problem 5 :

Students voted the most popular attractions at the local show to be the side shows (S), the farm animals (F), the ring events (R), the dogs and cats (D), and the wood chopping (W). The students in a class were then asked to name their favorite.

The data was : SRWSS WFDDS RRFWS RSRWS SRRRF

a) Draw a horizontal dot plot of the data.

b) Find the mode of the data.

Solution

Problem 6 :

The dot plot shows the times of sixth grade students in a 100-meter race.

a. How many students ran in the race.

b. How can you collect these data? What are the units?

Solution

Problem 7 :

The dot plot shows the lengths of earthworms.

a. How many earthworms does it represent?

b. How can you collect these data? What are the units?

Solution

Problem 8 :

Work with a partner. Identify the data set that is the least spread out and the data set that is the most spread out. Explain your reasoning.

Solution

Problem 9 :

The dot plot shows the top speeds of 12 sports cars. Find and interpret the interquartile range of the data.

Order the speeds from slowest to fastest.

• Find the quartiles.
• Check for outliers in the data set.

Solution

Problem 1 :

Use the line plot. Find the

(i) Mean   (ii) Median   (iii) Mode and (iv) Range 

of the data.

Solution

Problem 2 :

The dot plot shows the types of pets treated at a vet on one day.

a) How many pets were treated on this day?

b) Find the mode of the data.

c) What percentage of the pets treated were fish?

Solution

Problem 3 :

At recess time the sales of drinks were recorded over a three minute period.

O = 100 plus, S = soy milk, C = cola, I = iced tea.

The data was: OSSCI OCISO IOCSO OOOSC SOCOS SOOCO OIOIS

a Draw a dot plot of the data. b What is the mode?

Solution

Problem 4 :

Four girls on a high school track and field team practice the shot put. Each girl made 10 attempts, and the distances measure after each attempt are shown on the plots below.

a)  Which girl’s range of distance was the greatest?

Solution

Problem 5 :

Find the mean, median, and mode of each dot plot.

Solution

Problem 6 :

A teacher drew a line segment that was 20 inches long on the blackboard. She asked each of her students to estimate the length of the segment and used their estimates to draw this dot plot.

a. How many students were in the class?

b. Were students generally accurate in their estimates of the length of the line? Explain your reasoning.

Solution

Problem 7 :

Determine if each statement is true or false.

a) The range of the data for the heights of softball players is less than the range of the data for the heights of basketball players.

b) The median of the data for the heights of softball players is greater than the median of the data for the heights of basketball players

Solution