Because if I come into your shop and I want to buy 1 blort of milk, and you never heard of
the 'blort' and you only sell milk in buckets of 1 fleschl for 5 zlotys, I would have no idea
of how many fleschls to buy and bring home, or whether 5 zlotys is a reasonable price.
The most likely outcome is that I wouldn't buy anything from you, and I'd never walk into
your shop again. You'd realize pretty quick that you and all the other shopkeepers in town
would be wise to come up with standard units, or you'll all be out of business very soon.
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We need standard measurements because it helps us to find the measurements of things.
You need to use a table of standard scores.
You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.
To measure a physical quantity correctly and need to compare it with some standard quantities. Thus a standard unit is needed to measure a quantity correctly.
You need to know the standard deviation or standard error to answer the question.