jack gough is a L.E.D.N.G.E
Thirty is the English word for the number 30.
A mean is an average An example 10 +20 +30 =60 The mean/average of this is 20
It is 10.
It looks like an L, but, it is a one.
The letter G prefix to your serial number indicates that your Marlin rifle was made in the year 1950.
The expression "30 to the square root" is not clearly defined, but if you mean (30^{\sqrt{30}}), then this expression is irrational because it involves raising a rational number (30) to an irrational exponent ((\sqrt{30})). In general, a rational number raised to an irrational power results in an irrational number. Hence, (30^{\sqrt{30}}) is irrational.
Itself but if you mean 2, 3, 5 and 6 then it is 30
It is: 10+25+30+35 = 100 and 100/4 = 25 which is the average mean value
I am assuming you mean a model 1894 in 30-30,if that is the case your rifle was the last rifle made in 1961.
There must be more to that number? Is there a prefix letter in front of the number? Are you sure about that caliber? ".30-30 special" Do you mean .30-30, or .32 Special? Is there a rollstamp on the barrel, and what does it read? Check behind the hammer also, for a model designation. If there is a sight there, you will have to remove the two mounting screws to see it. marlinguy@juno.com
Mixed number? Do you mean 24hr time/military time? If you do, it would be 17:30
It is the Games of the XXX Olympiad and the roman numerals mean 30