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You take the difference between the second and first numbers.Then take the difference between the third and second numbers. If that difference is not the same then it is not an arithmetic sequence, otherwise it could be.Take the difference between the fourth and third second numbers. If that difference is not the same then it is not an arithmetic sequence, otherwise it could be.Keep checking until you think the differences are all the same.That being the case it is an arithmetic sequence.If you have a position to value rule that is linear then it is an arithmetic sequence.
You can find the differences between arithmetic and geometric mean in the following link: "Calculation of the geometric mean of two numbers".
Two numbers can have only one arithmetic mean. In this case, it is -2.5Two numbers can have only one arithmetic mean. In this case, it is -2.5Two numbers can have only one arithmetic mean. In this case, it is -2.5Two numbers can have only one arithmetic mean. In this case, it is -2.5
There is. Arithmetic mean is simple average of numbers not weighted by anything. However in EV, the numbers are weighted by their probability
The difference between arithmetic and geometric mean you can find in the following link: "Calculation of the geometric mean of two numbers".