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1 EA (each) does not have a direct conversion to kilograms (KG) because EA is a unit of count, not weight. To convert EA to KG, you need to know the weight of the specific item being measured. For example, if you have 1 EA of an item that weighs 2 KG, then 1 EA equals 2 KG for that specific item.
A matrix (plural matrices, or less commonly matrixes) is a rectangular array of numbers, such as an item in a matrix is called an entry or an element.
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.