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A data set is a list of numbers, and the SAT asks the same three questions about it over and over.
The mean is the average. Add every number in the list, then divide by how many numbers there are. For 4, 8, 6, 10, and 2, the total is 30, and 30 divided by 5 is 6.
The median is the middle number after you put the list in order from smallest to largest. Sorting first is the step people skip, so write the sorted list down. If the list has an even number of values, add the two middle numbers and divide by 2.
The range is the biggest number minus the smallest number. For 2, 4, 6, 8, 10 the range is 10 minus 2, which is 8.
Mean and median describe the center of a list. Range describes how spread out it is.
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