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**Mean, Median, Mode and Range**

By Miss Setchell

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**Definitions Mean – Average Median – Middle number**

Mode – Number seen the most often Range – Difference between the highest and lowest number Sum – The answer to an addition problem Addend – The numbers you added together to get the sum

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**Finding the mean is like evening out the numbers.**

2, 5, 2, 1, 5

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**Finding the mean is like evening out the numbers.**

2, 5, 2, 1, 5

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**Finding the mean is like evening out the numbers.**

2, 5, 2, 1, 5 mean = 3

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**How to Find the Mean of a Group of Numbers**

Step 1 – Add all the numbers. 8, 10, 12, 18, 22, 26 = 96

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**How to Find the Mean of a Group of Numbers**

Step 2 – Divide the sum by the number of addends. 8, 10, 12, 18, 22, 26 = 96 How many addends are there?

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**How to Find the Mean of a Group of Numbers**

Step 2 – Divide the sum by the number of addends. 1 6 6) 96 # of addends sum 6 3 6 3 6

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**What is the Mean of this set of numbers?**

The mean or average of these numbers is 14. 8, 10, 12, 18, 22, 26

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**What is the Mean of this set of numbers?**

The mean or average of these numbers is 15. 9, 11, 13, 20, 24

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Median – the middle number in a set of ordered numbers. 1, 3, 7, 10, 13 Median = 7

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**How to Find the Median in a Group of Numbers**

Step 1 – Arrange the numbers in order from least to greatest. 21, 18, 24, 19, 27 18, 19, 21, 24, 27

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**How to Find the Median in a Group of Numbers**

Step 2 – Find the middle number. 21, 18, 24, 19, 27 18, 19, 21, 24, 27

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**How to Find the Median in a Group of Numbers**

Step 3 – If there are two middle numbers, find the mean of these two numbers. 18, 19, 21, 25, 27, 28

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**How to Find the Median in a Group of Numbers**

Step 3 – If there are two middle numbers, find the mean of these two numbers. 46 = median 23 2) 46

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**What is the median of these numbers?**

16, 10, 7 7, 10, 16

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**What is the median of these numbers?**

18, 23, 8, 14, 6, 27 6, 8, 14, 18, 23, 27 Median is 16

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**What is the Mode of a group of numbers?**

-The number that occurs the most often 22, 13, 24, 12, 12, 23, 12

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**What is the Mode of a group of numbers?**

Step 1 – Put the numbers in order from least to greatest. 22, 13, 24, 12, 12, 23, 12 12, 12, 12, 13, 22, 23, 24

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**What is the Mode of a group of numbers?**

Step 2 – Find the number that occurs the most often. 12, 12, 12, 13, 22, 23, 24

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**What is the Mode of a group of numbers?**

- 12 is the number that occurs most often. 12, 12 12, 12, - 12 is the Mode.

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**What is the Mode of this group of numbers?**

The Mode is 15. 14, 15, 12, 11, 24, 15, 23

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**What is the Mode of this group of numbers?**

The Mode is 35. 35, 21, 56, 35, 23, 14, 12

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**What is the Mode of this group of numbers?**

There is no number that occurs more than once. 16, 12, 18, 29, 36, 11, 10 So, there is no Mode for this group of numbers.

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Range – the difference between the greatest and the least value in a set of numbers. 1, 1, 3, 7, 10, 13 13-1= __ Range = 12

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**How to Find the Range in a Group of Numbers**

Step 1 – Arrange the numbers in order from least to greatest. 21, 18, 24, 19, 27 18, 19, 21, 24, 27

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**How to Find the Range in a Group of Numbers**

Step – Find the lowest and highest numbers. 18, 19, 21, 24, 27

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**How to Find the Range in a Group of Numbers**

Step 3 – subtract the lowest number from the highest number. 18 27 – 18 = ___ , 19, 21, 24, 27 The Range is 9.

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What is the range? 29, 8, 4, 8, 19 4, 8, 8, 19, 29 29 – 4 = 25 range

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What is the range? 22, 21, 27, 31, 21, 32 21, 21, 22, 27, 31, 32 32 – 21 = 11 range

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**Review Mean – Average Median – Middle number**

Mode – Number seen the most often Range – Difference between the highest and lowest number Sum – The answer to an addition problem Addend – The numbers you added together to get the sum

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Quiz Find the Mean, Median, Mode and Range of this group of numbers: 3, 6, 4, 2, 7, 1, 8, 3, 5

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**3, 6, 4, 2, 7, 1, 8, 3, 5 Mean- Median- Mode- Range-**

Hint: Put the numbers in order from least to greatest before you begin. Mean- Median- Mode- Range-

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