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You have just written it - unless you mean "1,216"
a 'gross' means twelve dozen or 144
In order to find the mean of numbers, add up all of the numbers and thn divide it by the number of numbers there are. Adding two, five and twelve equals nineteen. Then divide three into nineteen, and this gives you a mean of 6.33.
A dozen is twelve. 9 x 12 = 108
the answer to it is 12,13,212