The example given is incorrect. It is a formula for calculating the number of combinations of n things taken k at a time. This does not concern absolute deviation.
Perhaps the formula below may be beneficial to be included:
Part 4, Section 3.17.7.17
ED
Proposed Disposition of DIS 29500 Comment CA-0070 (Modified: 2008-01-13) Yes, the formula for this SpreadsheetML function is incorrect. In Part 4, §3.17.7.17, page 2,545, line numbers 2627, it will be changed from The number of combinations is as follows, where number = n and number-chosen = k: to The average of the absolute deviations of a set of data points from their mean is as follows, where n is the number of arguments in argument-list, x is an argument in argument-list, and x-bar is the x mean value: 1 - Similar Comments: AU-0026 , CL-0024 , CO-0165 , DK-0162 , ECMA-0025 , FR-0466 , GB-0378 , MT-0004 , PH-0003 , US-0276 , UY- 0010
