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This unit covers common measures of center like mean and median. We'll also learn to measure spread or variability with standard deviation and interquartile range, and use these ideas to determine what data can be considered an outlier.
The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to greatest. The mode is the number that occurs most often in a data set.
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Practice computing the median of data sets presented in a variety of formats, such as frequency tables and dot plots.
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Practice finding the median of a data set. Like the mean, the median gives us a sense of the middle, or center, of the data.
Find the mean, median, and mode of the following sets of numbers. And they give us the numbers right over here. So if someone just says the mean, they're really referring to what we typically, in everyday language, call the average.
Here we give you a set of numbers and then ask you to find the mean, median, and mode. It's your first opportunity to practice with us!