Center and Spread Worksheet

Center and Spread

Read each question carefully and provide the best answer. Show your work where applicable.

1. Which measure of center is most affected by outliers?

2. What is the range of the data set: 12, 5, 18, 9, 21?

1. The   is the middle value in an ordered data set.

2. The   is the value that appears most often in a data set.

3. The difference between the maximum and minimum values in a data set is called the  .

1. Calculate the mean, median, and mode for the following data set: 8, 10, 12, 12, 18.

2. Explain why the median is sometimes a better measure of center than the mean.

Use the bar graph below to answer the following questions.

1. What is the mean test score for the students?

2. What is the median test score?

3. What is the range of the test scores?

1. The interquartile range is a measure of center.

2. A small range indicates that the data points are spread out widely.