For this example we will look at the nationwide sales (in millions) for franchises of Krispy Kreme Donuts for a 5-year period.

$221

$239

$262

$281

$318

The mean sales (or the average sales) is given by:

\[\bar{X}=\frac{\sum X}{n}=\frac{221+239+262+281+318}{5}=\frac{1321}{5}=264.2\]

That is the mean sales for the stores over the 5-year period is $264.2 million.