When we speak of average numbers, most people think of the classical formula of adding a given number of numbers together and then dividing the sum with the number of numbers involved. This, however, is only a special case of the average number and is only applicable for a probabilistic distribution that is unimodal, that is, all numbers are equally probable of appearing and being found.

In the general case, the average number of a set of numbers, is the sum of all numbers weighed by their probability function. For example, if we have 3 numbers, being 1, 2 and 4, and the probability of each number showing up is 0.2, 0.3, and 0.5. Then the average of this set of numbers is not:

(1 + 2 + 4) / 3 = 7/3,

instead the average is rather:

1 * 0.2 + 2 * 0.3 + 4 * 0.5 = 2.8

As we see, the term of average number is really very general and for this reason one should always be careful when taking the average of a set of numbers that one do not know the origin of.

Hello Mugklu44 welcome to Mybestanswer and thank you for the question. An Average number which is also known as the mean or the medium is that number you get when you add up all and anything you have in a set and dividing that total result you get by the number of items or things you have which you had added up to get that total for example having 20 baskets, 15 drums, 10 websites and 5 computers, adding them up all for example 20 + 15 + 10 + 5 = 50 and in order to get the average number, we divide 50 by 4 which is a set and the answer will be 12.5.

Add 20 + 15 + 10 + 5 (4 sets) = 50

Divide 50 / 4

12.5

Hope this helps. Good luck.

There are several forms of "average". The arithmetic mean is described by Actame17 above is widely used. There are also the geometric mean being the nth root of the product of n numbers, the harmonic mean which is the inverse of the arithmetic mean of the inverses of all the numbers in the set, as well as the median as described by Jockto86 above, plus the mode which is the most "popular" value in a unimodal distribution. For these it is best to read a stats text to know when to use them.

...The average most commonly referred to, is the 'median'. To find the median of a group of numbers, add them all up and the divide the result by the total of the numbers added. For example, you have the numbers, 2, 4, 6, and 8. Add them up, 2+4+6+8=20, then divide by numbers that were added (4) and you get 20 / 4 = 5. The median average for this group of numbers is 5.

To get the average of a set of numbers, you must add all of the numbers together, and then divide by how many numbers there are. Hope that helps.

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