Estimation make us got to the answer quickly.
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Estimation enables you to obtain a rough answer using only mental maths. An approximate answer can sometimes be sufficient.
Early estimation can help give an indication of the answer.
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If an estimation, or estimate, is a guess, an approximate estimation is a rougher guess.
There are a few methods in estimation. Like framework, unknown parameters, empirical dist and substitution principle most of these methods can be used using substitution principles.