Ask someone to tell you how long their commute is, and they can probably provide an average number without much thought. But ask them how much it varies, and they will most likely have to pause and ...

The empirical rule states that almost all observed data for a normal distribution will fall within three standard deviations of the mean ... deviation in percentage form. For example, the standard ...

filadendron / Getty Images Standard deviation ... and the mean. Once you figure that out, square and average the results. Using software like Excel can help you in this process. For example ...

suppose that the manufacturing process described in the previous example produces engines whose weights are normally distributed with a mean of 1250 and a standard deviation of 12. The following ...

An example involving ... that even with the same mean, median and mode, samples can differ greatly. How to calculate standard deviation using the defining formula is explained.