How an Outlier Changes the Mean, Median, and Mode
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How an Outlier Changes the Mean, Median, and Mode
Outliers worksheet for Grade 7: two data sets, each with one value far from the rest, to find the mean, median, and mode with the outlier and without it, then say which measure it changed most and which it did not change. With an answer key.
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- Pages
- 1
- Last updated
- Time
- About 20 minutes
- Answer key
- Included
- Goes with
- Adding, Deleting, and Outlying Data
- Printing
- Black and white
- Related curriculum
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Find the mean, median, mode and range of a data set, the quartiles and interquartile range, and the mean absolute deviation, and read and make dot plots, histograms and box plots.
Reviewed by Mr. Daniel Carter, Teacher. How we check worksheets
How to use this sheet
- Have the child put the data in order from least to greatest first, for every question.
- Write each measure with its label, so mean, median and mode are not mixed up.
- Ask which measure best describes the data, and why, when there is an outlier.
Common mistakes
- Finding the median without putting the data in order first.
- For an even number of values, choosing one of the two middle values instead of the mean of both.
- Mixing up the mean and the median.
- Thinking the mode is the biggest value. It is the value that appears most often.
