Grade 9 Math Worksheet: Outliers

Explore outliers in data sets, including identification using interquartile range (IQR) and their impact on measures of central tendency.

Grade 9 Math Probability and StatisticsOutliers

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Includes

2 Short AnswerMultiple ChoiceFill in the BlanksTrue / False

Standards

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

Topics

mathgrade 9outliersstatisticsdata analysis

7 sections · Free to use · Printable

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Grade 9 Math: Understanding Outliers

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Date:

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Read each question carefully and provide your answers in the space provided. Show all your work for calculations.

1. Consider the following data set: 12, 15, 18, 19, 22, 23, 24, 25, 50. Identify any outliers in this data set using the 1.5 * IQR rule. Show your calculations.

2. Which measure of central tendency is most affected by outliers?

Median

Mean

Mode

Range

3. The Interquartile Range (IQR) is calculated by subtracting the from the .

4. A quality control manager is monitoring the weight of cereal boxes. The weights (in grams) are: 345, 350, 348, 352, 347, 355, 300, 349. Calculate the mean, median, and identify any outliers. Explain how the outlier affects the mean and median.

5. Outliers should always be removed from a data set.

True

False