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If you mean: 2 4 8 16 then the numbers double up consecutively
Clarify. Subtract four consecutive numbers ... from what? It appears you mean something like: 22 - 21 - 20 - 19 And the answer is NOT -44. It is -38 ... negative double of the LOWEST number. If this is what you mean, then you have discovered another rule of mathematics. It will always work. 1001 - 1000 - 999 - 998 = -1996 Exactly the negative double of 998
The "mean" of a group of numbers is their "average". It doesn't tell you what the numbers are, or even how many numbers there are.
No, the geometric mean is not the same as the mean of two numbers.
Given a set of numbers, and its mean, we can find the difference between each of the numbers and the mean. If we take the mean of these differences, the result is called the mean deviation of the numbers.