Add all the numbers and divide that by the number of numbers.
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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 difference between arithmetic and geometric mean you can find in the following link: "Calculation of the geometric mean of two numbers".
Two numbers: 3.2 and 4: Geometric mean is 3.5777087639996634 Arithmetic mean is 3.6 Scroll down to related links and look at "Geometric and Arithmetic Mean".
It is then the [arithmetic] mean of the two number. The sam applies if you have 6 numbers. The median is the mean of the 3rd and 4th numbers (in order).
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.