An estimate is an approximate calculation or judgment of the value, number, quantity, or extent of something. Depending on context, dispatch can mean the sending of someone or something to a destination or for a purpose.
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Consider a distribution with an unknown parameter pi. If the true value of pi is not known but has been estimated, then the estimated value is usually denoted by pi-hat. This is to distinguish between a known parameter and an estimated one.
Estimation is a range of the subject spoken about. There is estimated to be over 90 different species of birds in California.
To the nearest hundred, 500
To the nearest thousand, 5000
One possibility is 55