Grade 9 Data & Statistics Worksheets

Solve each problem. Take your time.

1. 1.Consider the following set of data points: (1, 2), (2, 4), (3, 6), (4, 8). What type of correlation does this data suggest?
2. 2.A scatter plot shows data points that generally increase from left to right. What is the likely correlation?
3. 3.If a scatter plot shows data points that generally decrease from left to right, what type of correlation is present?
4. 4.Examine this data: 10, 12, 11, 13, 12. What is the median value?
5. 5.Given the data set: 5, 8, 10, 12, 15. What is the mean (average) of this data?
6. 6.A survey asks 100 people their favorite color. 30 choose blue, 25 choose red, 20 choose green, and 25 choose other. What is the mode of the favorite colors?

Solve each problem. Show your work.

1. 1.A Grade 9 class is collecting data on the number of hours students spend playing video games per week. The data collected is as follows: 5, 8, 2, 10, 6, 8, 4, 7, 9, 8. Calculate the mean, median, and mode of this data set.
2. 2.A scatter plot shows the relationship between the number of hours a student studies for a test and the score they receive. The points on the plot generally trend upwards from left to right. Describe the correlation shown by this scatter plot and explain what it means in this context.
3. 3.A survey asks 100 people about their favorite type of music. The results are: Pop (45), Rock (30), Hip-Hop (20), Classical (5). If the survey organizers want to create a pie chart to represent this data, what percentage of the pie chart should be allocated to Rock music?
4. 4.A company is investigating a potential privacy concern. They collected data on customer purchasing habits but shared it with a third-party marketing firm without explicit consent. Identify one ethical consideration that was potentially violated in this scenario.
5. 5.The equation of a line representing the cost of renting a bike is C = 3d + 10, where C is the total cost in dollars and d is the number of days rented. If a student rents a bike for 5 days, what will the total cost be?
6. 6.A researcher is comparing the average test scores of two Grade 9 classes. Class A has 25 students with an average score of 78. Class B has 30 students with an average score of 82. If the researcher combines the scores from both classes, what is the overall average score for all students?