Sure. If some of the items on the list are positive and some are
negative, then their average can be positive, negative, or zero.
But if all of them are positive, then their average must be more
than zero. Remember that the average is always greater than the
least item on the list, and less than the greatest one.
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size zero in the UK is an average of size 4
Yes it can be.
You don't need to. Average deviation (about the mean) is always zero!
Because the average deviation will always be zero.
On average, approximately zero.