1. The Variance
How to calculate it

2. From Raw Data

3. The Variance and Standard Deviation

4. Example 1

5. From a Frequency Table

6. Formula to find the Variance

7. Example 2 - Question
Calculate the variance for this set of data

8. Example 2 - Solution

9. Grouped Data
Use the same formula but find your mid-points to make x values just as you did for the mean

10. Coding to find the Variance

11. How and why use coding?

12. Example 3 - Question

13. Example 3 Solution Set out your table first

14. Example 3 Solution Then do the calculations

15. Example 4