An estimate is an approximate calculation or judgment of the value, number, quantity, or extent of something. An average is a number expressing the typical value in a set of data, most commonly the mean, which is calculated by dividing the sum of the values in the set by their number. An estimated average is a guess.
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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.
One possibility is 95
10.
One possibility is 55