It is usually impossible to work out exactly how large population will behave in any given circumstance. However, it may be possible to assign probabilities of different responses to each member of the population and then, using the rules of probability, calculate how the population - as a whole, or on average - is likely to behave.
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Lengendre was the one who introduced the importance of probability to statistics.
The answer would depend on the demographics of the population: a probability of 0.2 it too high unless the population is from a retirement area.
Non probability sampling and probability sampling are different because probability sampling uses random samples. Non probability sampling aren't random, but can still be representative of the population as a whole if done correctly.
is median a chafractoristic of population
The answer will depend on the population which is being studied.