If this is a question about prime numbers as the question category suggests, then never. Because a Prime number cannot be negative and - if it were relevant - must be a whole number.
I guess it would be possible to suggest: when a telephone number is a prime number?
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Numbers on a bar code are important because it is how the scanner recognizes the what product you are trying to buy. The lines and dashes are important to this as well.
It depends on what numbers you are using so thats the first question.
You simply change each of the numbers to its Roman equivalent, keeping the dashes. This would be shown as XII-XXIX-MMXII.
You can find the mean of a number by finding the average of the set if you do not know how to do that you add up all the numbers in the set the set and you divide it by how many numbers are in the set . for example : 1,2,3,4,5,6 ( these are the set ) 1+2+3+4+5+6= 21 ( that's when you add ) 21 / 6 = 3.5 ( and as you know the / is a division sign and when you get a decimal do not put it as a remainder put it as shown .)
You simply change each of the numbers to its Roman equivalent, keeping the dashes. This would be shown as VI-XXVI-MMIX.