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# Sec. 2.8 mean, median, mode and range

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### Sec. 2.8 mean, median, mode and range

1. 1. Learning Target:Students will learn how to calculate data using mean, median, mode and range. Students will learn how to justify which average best represents the data set.<br />
2. 2. Definitions:Mean (avg.) – Add up items Total itemsMedian – Middle # (must put them in order from smallest to largest)Mode – The value you see most oftenRange – Difference between the largest # and the smallest #Outlier – A number that is either a lot smaller or bigger then the rest of the data<br />
3. 3.
4. 4. Find the mean of the data.20, 25, 25, 20, 25<br />
5. 5. 20 + 25 + 25 + 20 + 2551155Mean = 23<br />
6. 6. Find the median of the data.(odd # of data values)91, 150, 80, 71, 74, 81, 83<br />
7. 7. Put them in order from smallest to largest. 91, 150, 80, 71, 74, 81, 83Find the middle value.71, 74, 80, 81, 83, 91, 150Median = 81<br />
8. 8. Find the median of the data(even # of data values)8, 13, 8, 4, 11, 4, 2, 6<br />
9. 9. Put them in order from smallest to largest.2, 4, 4, 6, 8, 8, 11, 13Find the middle value.2, 4, 4, 6, 8, 8, 11, 13Average the two numbers (6 + 8) / 214/2Median = 7<br />
10. 10. Find the mode.14, 10, 9, 7, 14, 16, 147, 1, 2, 6, 1, 726, 22, 10, 12, 16, 28<br />
11. 11. 14, 10, 9, 7, 14, 16, 14mode = 147, 1, 2, 6, 1, 7mode = 1 and 726, 22, 10, 12, 16, 28mode = no mode(write no mode, do not just put a 0)<br />
12. 12. Find the range.91, 150, 80, 71, 74, 81, 80, 77<br />
13. 13. 91, 150 , 80, 71 , 74, 81, 80, 77150 – 71Range = 79<br />