Center and Spread Worksheet

Grade 9 Math worksheet covering measures of center (mean, median, mode) and spread (range, interquartile range, standard deviation) with various data sets.

Grade 9 Math Probability and StatisticsCenter and Spread

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Includes

Short AnswerFill in the BlanksMultiple ChoiceLong AnswerTrue / False

Standards

CCSS.MATH.CONTENT.HSS.ID.A.2CCSS.MATH.CONTENT.HSS.ID.A.3

Topics

mathgrade 9statisticscenterspreadmeanmedianmoderangeIQRstandard deviation

7 sections · Free to use · Printable

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Center and Spread Worksheet

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Read each question carefully and provide the best answer. Show all your work for calculations.

1. Consider the following set of data: 12, 15, 18, 12, 20, 22, 15, 17, 18. a) Calculate the mean of the data set.

b) Find the median of the data set.

c) Determine the mode(s) of the data set.

2. The is the difference between the highest and lowest values in a data set.

3. The is the range of the middle 50% of the data.

4. A high standard deviation indicates that the data points are out from the mean.

5. Which measure of spread is most affected by outliers?

Interquartile Range (IQR)

Standard Deviation

Range

Median

6. Two classes took the same math test. Class A had scores: 75, 80, 82, 85, 90. Class B had scores: 60, 70, 85, 95, 100. a) Calculate the mean score for each class.

b) Calculate the range for each class.

c) Which class has a wider spread of scores? Justify your answer.

7. The mode is always a unique value in a data set.

True

False

8. The median is a good measure of center when the data set contains outliers.

True

False