2.1.1063 Part 1 Section 18.17.7.339, VARA

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a.   The standard does not specify what happens if sample size is less than or equal to 1.

Office returns #DIV/0! if sample size is less than or equal to 1.

b.   The standard does not specify how function arguments map to formula variables.

Office maps x to a sample value, x-bar to AVERAGE(argument-1, argument-2,...,argument-n) and n to sample size.