1. How do you know when a result is reasonable?

2. Unit Questions
Did you know that we probably use statistics such as mean, median, mode, and range without even noticing it?
What is and how do we find the mean, mode, median, and range?
Why should we learn these math concepts?

3. Mean, Median, Mode, Range By
Nikki Goodwin

4. Overview Today we will learn…
Mean
Median
Mode
Range

5. What is Mean? The mean is the numerical average of a set of data.
The mean is found by adding all the values in a set of data, then dividing the sum by the number of values.

6. Let’s Try It… Lets find Dylan’s Science grade for his report card. 9784 88
100 95 63 73 86
Before we calculate the mean for this data, Can you give me a reasonable guess?
How do you know your guess is reasonable?

7. Remember the steps for finding the mean.
Step 1- Add all the values
Step 2- Divide
Step 3- Find the Average

8. Lets find Dylan’s MEAN science test score?97 84 88
100
Step 2
Step 1 95
Divide the sum
by the number
of values.
Add all
the values. 63 73 86
783 9 ÷ + 97
The mean is 87
783

9. Think middle when you hear median.
Sounds like
MEDIUM
Think middle when you hear median.
small
medium
large

10. What is the MEDIAN? How do we find it?
The MEDIAN is the number that is in the middle of a set of data.
Steps for finding the median
1. Arrange the numbers in the set in order from least to greatest.
2. Then find the number that is in the middle.

11. 63 73 88 95 84 86 97 97 The median is 88. 100 Arrange values from
least to greatest. 63
100 73 88 95 97 84 86 97
Find the number that is in the middle.
The median is 88.
Half the numbers are
less than the median.
Half the numbers are
greater than the median.

12. What is the MODE? How do we find it?
The MODE is the piece of data that occurs most frequently in the data set.
A set of data can have:
One mode
More than one mode
No mode

13. The value 97 appears twice.
Arranging values from least to greatest
makes it easier to find the mode. 63
100 73 88 95 97 84 86 97
Find the number that appears more or most frequently.
The value 97 appears twice.
All other numbers appear just once.
97 is the MODE

14. What is the RANGE? How do we find it?
The RANGE is the difference between the lowest and highest values.
largest number
smallest number -
RANGE

15. What is the RANGE of this set of data?86 88 48 99 84 97 71
_ 99 48 51
51 is the range of this data set

16. Now you try what we just learned Find the….
Median
Mean
Mode
& Range

17. Mean
Median
Mode
Range

18. Video on Mean, Median, Mode, and Range
Websites
Video on Mean, Median, Mode, and Range