That depends what the numbers are.
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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
The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.
The arithmetic mean of one number, such as 104410231017 is still simply that number.
There is. Arithmetic mean is simple average of numbers not weighted by anything. However in EV, the numbers are weighted by their probability
Add all the numbers and divide that by the number of numbers.