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.
To the nearest thousand, 5000
To the nearest hundred, 500
One possibility is 55