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Range is between 2 points and is the difference of the lowest and highest number.the range is found to the highest and lowest of the data differences.

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You need to add all the numbers up and divide the new number by how many numbers there were before.

So you could add 12 21 3 5 9 together and get 50. But you need to divide it by 5 because there were 5 different numbers.
Example
12+21+3+5+9=50
50/5= 10

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Mean,.Median,Mode

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Math Antics | Math Video Lessons for Free plus more

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The median is the separating value the bigger half from the smaller  half of a data sample. For a data set, it may be though of a middle value. for example in the data set 1,3,3,6,7,8,9 the middle is the six because its the fourth largest and the fourth smallest.

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You need to find the number that appears the most.

You might want to use mode when you need to know how many things to buy.

For example. You passed out snacks in a party and next week you're going to throw another party and pass out snacks. So you need to count how many cookies they ate. If most people ate 10 snacks then you would buy the 12 pack snack box.