A statistical average is called the norm. If you live in a town made up mostly of farmers but your trade is basket weaving, then you're outside the norm.
The noun norm is from the Latin word norma, which was a carpenter's square or pattern used in construction to make regular corners. Now we use norm for anything that sets a standard. You can score within the norm on a standardized test, score above the norm on an IQ test, or fall below the norm in acceptable standards of dress if you wear a halter top and cutoff jeans to a formal ball.
Definitions of norm
1
n a standard or model or pattern regarded as typical
“the current middleclass
norm of two children per family”
 Type of:

criterion, measure, standard, touchstone
a basis for comparison; a reference point against which other things can be evaluated
n a statistic describing the location of a distribution
“it set the
norm for American homes”
 Synonyms:
 average
 Types:
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age norm
the average age at which particular performances are expected to appear

modal value, mode
the most frequent value of a random variable

median, median value
the value below which 50% of the cases fall

mean, mean value
an average of n numbers computed by adding some function of the numbers and dividing by some function of n

arithmetic mean, expectation, expected value, first moment
the sum of the values of a random variable divided by the number of values

geometric mean
the mean of n numbers expressed as the nth root of their product

harmonic mean
the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers
 Type of:

statistic
a datum that can be represented numerically