When estimating 13.44, it is helpful to round to the nearest whole number. In this case, 13.44 would round to 13. Estimation is a quick way to get a rough idea of the value of a number without needing to calculate exact figures.
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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