While there are certain characters, such as pi, which reprsents the ratio of the circumference of a circle to its diameter (approximately 3.1519), and there are cases where, within a certain context, a character always stands for one number (i.e in astrophysics, C almost always represents the speed of light), in most forms of mathematics, a letter an equation simply represents a variable (sometimes this variable has to be solved for, other times a value can be plugged in to solve for another variable).
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number line?
The whole number form an infinite set.The natural numbers less than 100000 form a finite set(either 99999 or 100000 members, depending on whether 0 is considered a natural number).The letter of the alphabet form a finite set (26 members for the English alphabet).The odd numbers form an infinite set.
Explain the question a bit more..There are 26 letters in the alphabet...
45
Add up the numbers, and then divide by the number of numbers in the set. This will give you the mean.