Posted by **ami** on Thursday, August 30, 2012 at 1:38pm.

Use the definition of the mean to show the sum of the deviation of the observations from their mean is always zero. This is one reason why variance and standard deviation use squared deviations.

- Stor 155 -
**PsyDAG**, Saturday, September 1, 2012 at 3:21pm
Think of the mean as a *fulcrum* (balance point) of a distribution. To balance, the weights and distances from the fulcrum must be equal, therefore subtracting one side from the other will always = 0 (assuming that you did your calculations correctly).

- Math/Statistics -
**PsyDAG**, Saturday, September 1, 2012 at 3:23pm
Sorry for the repeat. However, you need to indicate your subject in the "School Subject" box, so those with expertise in the area will respond to the question. You just lucked out with me responding.

## Answer this Question

## Related Questions

- Stor - Here is a simple way to create a random variable X that has mean μ ...
- math - Using the data in the table, calculate the mean, range, variance, and ...
- math - Using the data in the table, calculate the mean, range, variance, and ...
- Stastics - When we convert x-value to z- score and use Standard Normal ...
- math - Using the data in the table, calculate the mean, range, variance, and ...
- Math - Roughly speaking, the standard deviation indicates how far, on average, ...
- Statistics - The table below shows the LOS for a sample of 11 discharged ...
- Statistics - Suppose that the fit to the simple linear regression of Y on X from...
- Consumer math - Complete the chart to find the mean, variance and standard ...
- Statistics - The table below shows the LOS for a sample of 11 discharged ...