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Mean, Median, and Mode Mean, Median and Mode Measures of Central Tendency.

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Presentation on theme: "Mean, Median, and Mode Mean, Median and Mode Measures of Central Tendency."— Presentation transcript:

1 Mean, Median, and Mode Mean, Median and Mode Measures of Central Tendency

2 Mean, Median, and Mode Mean, Median and Mode What is the mean? The SUM of the data, divided by the number of items in the set of data ….. commonly called the average.

3 Mean, Median, and Mode Mean, Median and Mode What is the mode? The data item that appears the MOST

4 Mean, Median, and Mode Mean, Median and Mode What if the data all appear the same number of times? 1,1,2,2,3,3,4,4

5 Mean, Median, and Mode 1,1,2,2,3,3,4,4 There is NO mode

6 Can there be more than one mode? 1,2,2,3,4,4,5,6,7

7 1,2,2,3,4,4,5,6,7 Yes, there are two modes. What are they? 2 and 4

8 Mean, Median and Mode What is the median?

9 Mean, Median, and Mode What is the median? The middle number in the set of data when written in order (first step we do) Given: 2,14,28,0,1,1 Reorder from least to greatest 0,1,1,14,28 The middle number is 1

10 Mean, Median, and Mode What if you have an even set of numbers? Given: 10, 0, 20, 30 Reorder from least to greatest 0,10, 20, 30 Add the two middle numbers together. Divide by 2. What is your median? 15

11 Mean, Median, and Mode Mean, Median and Mode What is an outlier? A data item that is far apart from the rest of the data items Which will an outlier affect the most: the mean, median or mode? (Hint: Think of class test scores

12 Mean, Median, and Mode Mean, Median and Mode What is the range? The difference between the largest and smallest data values

13 Mean, Median, and Mode Mean, Median and Mode Lets try one … 2, 1, 0, 1, 5, 3, 4, 2, 0, 3, 1, 2 Step 1 – Rewrite in order from least to greatest

14 Mean, Median, and Mode Mean, Median and Mode 2, 1, 0, 1, 5, 3, 4, 2, 0, 3, 1, 2 Mean 2 Range 5 Median 2 Mode 1 and 2

15 Mean, Median, and Mode Mean, Median and Mode Test scores in an Algebra class: 99, 85, 80, 25, 99, 100 What is the mean, median, mode and range? Mean 81.3 Median 92 Mode 99 Range 75

16 Mean, Median, and Mode Mean, Median and Mode Write a paragraph about what would be your most useful indicator of central tendency in this case: You are ordering a small number of shoes for your shoe store based on the sales of sizes from last year. Write why you made your selection. Why did you not choose the other two?


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