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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.
A expression in maths is a collection of terms without an equality sign.
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An altitude is measured from mean seal level on Earth. So asking what the planet's altitude is, is a nonsense question.
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.