How do I calculate the variance of {3,6,7,8,9}?
1 Answer
Explanation:
Where:
Step 1  Find the mean of your terms.
Step 2  Subtract the sample mean from each term (
Note: The sum of these answers should be
Step 3  Square each of the results. (Squaring makes negative numbers positive.)


Step 4  Find the sum of the squared terms.
Step 5  Finally, we'll find the variance. (Make sure to 1 from the sample size.)
An extra, if you'd care to expand  from this point, if you take the square root of the variance, you'll get the standard deviation (a measure of how spread out your terms are from the mean).
I hope this helps. I'm sure that I didn't need to write out every step, but I wanted to make sure you knew exactly where each number was coming from.