The answer depends on the extent to which the number is being estimated.
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It could estimate to 480 or even 500, depending on what way you want to estimate it to.
It is ok, but you could get better estimates.
Given a value for some variable, it is the maximum value that it could have had wich would have been rounded to the given value.
The estimate for 15,772 is 10,000
It is an estimate that is quite safe