Mean, median, mode (1)
- 2. The average of a set of numbers, found by dividing the sum of the set by the number of addends. Mean Think about when your grades are averaged in school.
- 3. MeanHere is an example: 74, 91, 63, 92, 85 74 405 ÷ 5 = 81 91 63 92 +85 A calculator is very helpful.
- 4. Now let’s try one together. Get your calculators ready. Add these numbers: 100 + 85 +++ 90 75 85 = 435 is your total. Now it is time to divide. 435 ÷ by how many numbers there are 5 = Did you get 87?
- 5. Median The middle number in a set of data that are arranged in order. Think of monkey in the middle. Who me?
- 6. Here is an example: 1, 3, 4, 6, 7 median The median of 1, 3, 4, 6, and 7 is 4. Median Which number is in the middle? 21, 16, 38, 32, 25 Here is one for you to try. You have to put them in order first! 25
- 7. The number or item that occurs most often in a set of data. Mode When you think of mode, think MOST. Which fruit is there the most of?
- 8. ModeHere is an example: 1, 3, 4, 4, 6 4 occurs most often. The mode of 1, 3, 4, 4, and 6 is 4.Time for you to try one. Remember, put them in order first! 31, 21, 31, 21, 21, 21 21 is the mode since it occurs most often.
- 9. Let’s listen to a song about all three!
- 10. Let’s find the mean, median and mode of these numbers. 14 ,21 ,42 ,21 ,35 ,21 ,49 Mean – Remember this is the average. First, add the numbers. 14 + 21 + 42 + 21 + 35 + 21 + 49 = 203 Next, count how many numbers you have. 7 Then, we divide our total 203 ÷ 7. Our mean is 29 !
- 11. Median – Don’t forget this is the number in the middle. 17,19,21,21,21,33,42 A great strategy to help you is to mark out the numbers on the end to get to the number in the middle. X X 21 is the median!
- 12. Mode – Remember this is the number or item that occurs the most. 17, 21, 42, 21, 19, 21, 33 What number was repeated the most? 21 is the mode!
- 13. Range Is the difference between the largest value and the smallest value. Let’s go back through the slides to find the range of each set of data.