When there is uncertainty about the outcome of a trial or experiment.
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We can use it to find the coefficients of numbers when we expand a binomial. We also use it in probability theory. In fact there are many uses for it.
Yes.
Most people are not statistically trained so the probability of whether or not you are forecasting is so close to 0 that knowing its value is of little help.
Fair dice have a 1/6 probability of showing any one of its numbers on top. This, is a simple example which most people are familiar with. It is therefore a useful way to introduce various concepts related to probability.
its easy idiots, you use it when guessing :)